Mr556 quad rail

This 11" FDE/Brown Quad HK rail was sold by Brownells for a period of time but seems to be quite rare in most HK circles. It's a lovely champagne color in the sunlight Considering this rail's condition I an asking $300.00 shipped. SOLD/Trade I also have a 12.5" MLOK Rail for the MR556 which is in great shape minus a couple of scratches.

the standard quad rail that comes on the MR and 416, is bulky/large diameter. I personally would never use that much rail space, so why pack it around. … Login. HK 416 CAG Geissele Style Quad Rail Foregrip Handguard Tan. $27900. SKU: 416CAGGFR-1Categories: 416 417 G28 M110, New Products, Services HK416 MR556Tags: 416, 416 CAG, MR556Product ID: 6516. HK 416CAG, Geissele style (Clone) CAG rail foregrip/handguard with 3 removable CAG rails. Fits HK MR556/416 and all in spec clones. A stair railing height code is the list of building code specifications for the required height of a railing on a stairway for safety purposes. Railing height codes differ based on...The Heckler & Koch MR556 Quad Rail Handguard 236204 is a quality addition to the Heckler & Koch lineup. For more great deals on Gun Parts by Heckler & Koch, please browse our Heckler & Koch Gun Parts page.Ruby on Rails, commonly known as RoR, is a popular web development framework that has gained significant traction in recent years. Ruby on Rails is an open-source framework written... Sale Price$52.95. UTG M-LOK Handguard Angled Index Mount Matte Black. Regular Price$39.99. Sale Price$24.97. The UTG PRO M-LOK® H&K MR556 15" Super Slim Free Float Handguard Rail forend is compatible with HK Slim Line Gas Block (MR556 Uppers). The Super Lightweight handguard has a 36 slot picatinny top rail for flush fitting and continuous wit. H&K MR556 Quad Rail Handguard 236204. Be the first to review this product. H&K MR556 Quad Rail Handguard. Manufacturer: Heckler & Koch. SKU: 130453. Manufacturer part number: 236204. UPC: 642230247642. $379.00.HK416/MR556; M4/AR15; Accessories. Model / TOY; Upper Accessories; ... HK style Quad rail- 11" for M27 IAR. Out of stock. Quick View. SMR screw repairation pack ...

Switzerland is renowned for its breathtaking landscapes, picturesque towns, and efficient rail network. One of the best ways to explore this stunning country is through a rail tour...Heckler Koch MR556 Quad Rail Handguard 236204. SKU 236204-HK. Review this product. Item is out of stock and cannot be backordered.Geissele released 14.5" M-LOK Super Modular Rail for HK416 / MR556 . See less See more 8 ... My MR is a BB date code that came with the original short quad rail. I ...Rail Size. Weapon Platform. Color. Rail Type. 52 Items. Show. Sort By. 9.3" Super Modular Rail MK16 M-LOK® - OD Green. $350.00. In stock. View Details. 9.3" Super Modular …The German-born rifle is currently the service rifle for USMC Infantry and is known as the M27. The closest proximity to a clone correct model of the HK416 was the MR556 but, it had some key differences that the clone community wasn’t fans of. The new BRN-4 is compatible with HK416 parts and has the quad rail that is seen on the M27.

New latest production HK 416A5, MR556 9" quad rail with integrated built in front flip up sight. Latest upgraded design with the laser markings for the adjustable gas block for …HK MR556 416 Adjustable Gas Block For 14.5-16in Barrel $ 419 00. Out of stock. ... HK 416D Style N-S Cutout Quad Rail Foregrip Handguard Black $ 199 00. Quad Rail - HK 416, MR556 HK German 416, MR556 Quad Rail Without Mounting Screw.Charcol gray in color. Fits all: MR556 HK416 Length: 9 1/4" HKP-16858 The Super Modular Rail HK416 M-LOK was designed to replace the standard rail on an HK416 or MR556 weapon platform. The rail system utilizes the stock HK barrel nut, but incorporates the strength, rigidity and modularity expected of a Geissele product. Made from 6061-T6 aluminum and finished in type 3 hardcoat anodize, the SMR HK416 M-LOK meets ...Nov 23, 2022 · ryandarr1979 said: Here is my 416 11” compared to a Caracal 816A2. The height over bore as I can tell are identical. You’ll notice the Caracal’s MLOK rail isn’t as thick as the quad rail as the quad rail bottom rail sits below the pivot pin. The rail clamp bolt is absent as well given the MLOK rail secures in the top rail of the Caracal ...

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Features of Heckler & Koch Complete MR556 Upper Reciever. Complete MR556 Upper Receiver/Barrel Assembly HK 16.5 inch cold-hammer forged barrel, upper receiver with forward assist, extended convertible charging handle, HK Free Floating Rail System handguard. Complete MR556 Bolt Group Assembly. Tungsten Filled HK Proprietary Buffer.HKRM5-130. $399.95. Quantity: Add to Wish List. Description. Additional Information. Rail System - 13.75? - Brown - M-Lok - HK MR556 The New KDG HK 556 M-Lok rails are direct mount rail system, replacing the factory HK 556 rail systems. These new rails are identical in design to their big brother, the KDG HK 762 M-LOK Rail system.HK designed & manufactures in Germany 11" HK416, MR556 extended quad rail. This drop in unit offers 2 full inches in extra length. Not the standard 9" rail that comes with the HK 416/MR556 but...2500 posts · Joined 2006. #3 · Dec 5, 2020. I would just buy HK Qrail it add weight but you can so much more with it. Like. rmbrclub Discussion starter. 602 posts · Joined 2020. #4 · Dec 5, 2020. I might actually just do that since I'm not going for a CAG clone build. Makes more sense to then pair it with my 516, which also has a quad rail ...

When it comes to enhancing the safety and aesthetic appeal of your staircase, hiring a reputable stair railing contractor is crucial. With so many options available in the market, ...MR556 5.56mm 30rd magazine (steel) 59: 233609S: 642230245334: MR556 5.56mm 20rd magazine (steel) 69: 235642S: 642230246492: MR556 5.56mm 10rd magazine (steel) 69: 236204: 642230247642: MR556 9" quad rail handguard: 379: 50233617: 642230247635: HK416 11' handguard: 416: 51000223: 642230262157: MR556 9" M-LOK handguard, black: 289: 51001100: ... H&K HK MR556/MR762/HK416 A5 Rail Cover Set - RAL 8K. Each rail measures:8 3/8" Long (X2), 1 X Short rail 6" Long1 3/8" WideBrand new Heckler & Koch HK 416A5 Style picatinny rail covers made of high impact HK polymer. Each rail is equipped with a quick release tab & marked with the HK logo. These are specifically made for HK MR762, MR556 & HK ... New latest production HK 416A5, MR556 9" quad rail with integrated built in front flip up sight. Latest upgraded design with the laser markings for the adjustable gas block for suppressed and non-suppressed use, new attachement hardware, and flip up sight. This is the factory correct handguard now found on the latest HK model the … Login. HK 416A5 Style Quad Rail Foregrip Handguard Tan/RAL8000. $27900. SKU: HK416BCGN-1-1Categories: 416 417 G28 M110, New Products, Services HK416 MR556Tags: 416, 416A5, MR556, RAL8000Product ID: 5063. HK 416A5 style quad rail foregrip/handguard with built in front sight. Fits HK MR556/416 and all in spec clones. The KDG HK556 rails come in two lengths a 10 inch and 13.75 inch available in black and brown type 3 hard coat anodizing. Specs: Overall length: 13.75 in. Weight: 13.6 oz. Finish: Black anodize type 3 hardcoat. Material: 6061 T6 aircraft grade aluminum. Compatibility: All HK416 variants including 416, MR556, and M27. Omaha Outdoors has custom and factory in stock HK MR556 models for sale. ... HK MR556 Quad Rail. Price $379.00. 236204. Heckler and Koch (HK) ... HK MR556 9 Inch Rail ... Login. HK 416 CAG Geissele Style Quad Rail Foregrip Handguard Tan. $27900. SKU: 416CAGGFR-1Categories: 416 417 G28 M110, New Products, Services HK416 MR556Tags: 416, 416 CAG, MR556Product ID: 6516. HK 416CAG, Geissele style (Clone) CAG rail foregrip/handguard with 3 removable CAG rails. Fits HK MR556/416 and all in spec clones. Kalbarri, Western Australia, is known for its breathtaking landscapes and outdoor adventures. From soaring cliffs to rugged gorges, this coastal town offers an abundance of natural...Product Info for Midwest Industries HK416/MR556 Handguard, M-LOK. 13.5" HK416 / M556 Handguard M-Lok Compatible. Simple installation, direct replacement for HK factory handguard. Retains factory barrel nut. Mil-spec top rail. Seven sides of M-Lok compatible slots. Lightweight, rugged 6061 aluminum construction, mil-spec hard coat anodized.MR556 5.56mm 30rd magazine (steel) 59: 233609S: 642230245334: MR556 5.56mm 20rd magazine (steel) 69: 235642S: 642230246492: MR556 5.56mm 10rd magazine (steel) …HKRM5-130. $399.95. Quantity: Add to Wish List. Description. Additional Information. Rail System - 13.75? - Brown - M-Lok - HK MR556 The New KDG HK 556 M-Lok rails are direct mount rail system, replacing the factory HK 556 rail systems. These new rails are identical in design to their big brother, the KDG HK 762 M-LOK Rail system.

Jun 24, 2021 · HibikiR. 240 posts · Joined 2019. #8 · Jun 25, 2021. Looking at the French HK416, a 9.5" railed handguard would be enough to cover most if not all of the gas block. However, that handguard type is meant to be paired with the A5 upper, not the MR556 upper. Too bad nobody has them in stock right now. Like.

416C length quad rail handguard; QD flip up rear sight; Gas block mounted flip up front sight; Collapsible 416C stock; Ambidextrous C rear sling swivel plate; Ribbed 416C style …itted to the MR Series. Both HK rail system handguards can be installed and removed with simple tools and return to zero when reinstalled. The MR556A1 also has a Picantinny … DEMO, Heckler & Koch HK416 Handgaurd, 11 in, 50233617 , MPN: 50233617-DEMO , Code: 13-FO-ML4161T-50233617-DEMO. Shop Heckler & Koch HK416 11" Handgaurd | 19% Off 5 Star Rating on 4 Reviews for Heckler & Koch HK416 11" Handgaurd + Free Shipping over $49. If you are an outdoor enthusiast looking for a new adventure, owning a quad can be an excellent choice. Whether you are into off-roading, exploring remote areas, or simply want a f...Features & Field Strip. HK MR556A1, Gen 3 PMAG and Tools. The new MR556A1 now ships with a Gen 3 PMAG, tools, lock, and user manual. HK Scope Mount and the EOTech Vudu 1-6 scope. As mentioned earlier, included with this review rifle was a pre-mounted EOTech VUDU 1-6×24 FFP optic in a new HK branded KDG Modular …International Building Code regulations state that a deck railing must be at least 36 inches high if the deck is 30 inches or more higher than the adjoining ground.Jun 14, 2021 · geissele handguard kinetic mr556 rail. Jump to Latest Follow. 34K views 71 replies 20 participants last post by FloridaMan 8d ago. FloridaMan Discussion starter. 87 posts · Joined 2021. #1 · Jun 13, 2021 (Edited) *UPDATE 07/2021: Geissele SMR M-LOK added. --------------------------------- Hey everybody,

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The Upper Receiver Kit also has a Picatinny rail machined into the top of its upper receiver for mounting optics and mechanical sights. Part No. 81000584, UPC 642230262607 – MR556, Upper Receiver kit – includes bolt, buffer, buffer spring, rifle length M-LOK handguard and 16.5″ medium contour barrel assembly – MSRP $2,069Traveling by train is a convenient and efficient way to get around, but the cost of national rail tickets can quickly add up. Luckily, there are several tips and tricks you can use... 1944Willys's Review of Heckler & Koch MR556 Quad Rail Handguard. Great example of you get what you pay for....expensive, but bulletproof! Excellent workmanship, perfect finish, and airtight lockup with the barrel nut. The only drawback on this is the weight, on a firearm that’s already front heavy. The dual shield Rg6 and quad shield Rg6 cables themselves are exactly the same, but the Quad shield housing offers more protection against static inference than the standard Rg6 ca... Includes a New Factory HK-416 Short 9″ Inch Quad Rail Modified with the Adjustable Gas Block Access Cut-Out and Marked N-S. Test Fired by TDyer Gunsmith Only with and With-Out a Suppressor for Function Check. Factory Black. S/N 241-402231 File Pics. HK 416, MR556 Quad Rail- Standard LengthHK German HK416 & MR556 quad rail complete that includes HK 416/MR556 Handguard Screw. This handguard can also be installed on the CR556 models... HKP-02546 Add to Cart. Quick view. HK MR556/416 10.5" Super Modular Rail System - Black. Geissele $459.95 ...ryandarr1979 said: Here is my 416 11” compared to a Caracal 816A2. The height over bore as I can tell are identical. You’ll notice the Caracal’s MLOK rail isn’t as thick as the quad rail as the quad rail bottom rail sits below the pivot pin. The rail clamp bolt is absent as well given the MLOK rail secures in the top rail of the Caracal ...HK MR556 Upper kit includes: Complete MR556 Upper Receiver/Barrel Assembly— HK 16.5 inch cold-hammer forged barrel, upper receiver with forward assist, extended …Picked up a 2021 MR556. Changed out the M-loc rail for the German made 11" quad rail and added a Tango Down VFG and some Knights Armament sights. I do have a Hk … ….

USC/UMP Receiver Rail. $19.99. Add to cart. G36K Handguard with Heat shield. $63.00. ... MR556/MR762 Carrying Sling. $108.00. OUT OF STOCK. Notify Me. HK 33.0mm ...Login. HK 416/M27 USMC Style Quad Rail Foregrip Handguard Black. $27900. SKU: M27QRFGHGCLNE-1Categories: 416 417 G28 M110, Services HK416 MR556Tags: 416, M27, MR556Product ID: 6167. HK 416/M27 USMC style quad rail foregrip/handguard. Fits HK MR556/416 and all in spec clones. Clone part ( not factory HK )HK 416 / MR556 11” Quad Rail w adjustable gas cutout. RARE GENUINE HK 11” quad rail with N and S cutout for adjustable gas block. Never mounted and only just taken out of bag for photos just now. Good luck finding one of these. Bought this from ZIB Militaria and surprise they shipped a 11” instead of a 9”. Now they are sold out forever ...As seniors enter their retirement years, many find themselves with the time and freedom to embark on new adventures. One popular option for senior travelers is rail vacations. One ...Are you in the market for a new quad? Whether you’re an off-road enthusiast or simply looking for a fun way to explore the great outdoors, buying a quad can be an exciting but over...HK 416 / MR556 11” Quad Rail w adjustable gas cutout. RARE GENUINE HK 11” quad rail with N and S cutout for adjustable gas block. Never mounted and only just taken out of bag for photos just now. Good luck finding one of these. Bought this from ZIB Militaria and surprise they shipped a 11” instead of a 9”. Now they are sold out forever ...Quad Rail - HK 416, MR556 HK German 416, MR556 Quad Rail Without Mounting Screw.Charcol gray in color. Fits all: MR556 HK416 Length: 9 1/4" HKP-16858For the new series of Heckler and Koch semi-automatic MR rifles, HK designers and engineers believe best accuracy comes with an unlined bore.”. The MR556A1 features a 16.5” barrel with a 1x7 barrel twist that’s free floated and covered by a removable quad rail. Housed inside the quad rail is the system’s gas piston and push rod.The German-born rifle is currently the service rifle for USMC Infantry and is known as the M27. The closest proximity to a clone correct model of the HK416 was the MR556 but, it had some key differences that the clone community wasn’t fans of. The new BRN-4 is compatible with HK416 parts and has the quad rail that is seen on the M27.New, Factory MR556 Quad Rail Handguard, Complete with screw and spring. It's been mounted on my upper once, but never used and you wouldn't be really able to tell that it was mounted. Retail is $322 and I will let it go for SOLD!!!! Shipping is limited to Continental USA ONLY and includes... Mr556 quad rail, Login. HK 416A5 Style Quad Rail Foregrip Handguard Tan/RAL8000. $27900. SKU: HK416BCGN-1-1Categories: 416 417 G28 M110, New Products, Services HK416 MR556Tags: 416, 416A5, MR556, RAL8000Product ID: 5063. HK 416A5 style quad rail foregrip/handguard with built in front sight. Fits HK MR556/416 and all in spec clones., 416C length quad rail handguard; QD flip up rear sight; Gas block mounted flip up front sight; Collapsible 416C stock; Ambidextrous C rear sling swivel plate; Ribbed 416C style …, Because these genuine article, Heckler & Koch 416/MR556 free-float rail systems are sourced from actual H&K stock of like-new surplus, there MAY be MINOR ..., HKP-17657. UPC: $9.95. Quantity: Add to Wish List. Description. Additional Information. HK416, MR556 Replacement Handguard Rail Screw - Hex- Stainless Steel Hex head replacement handguard retension screw for your HK416, MR556 forearm. Made in the USA from 17-4 SS with a 5mm hex head for ease and use when installing and taking off the forearm. , HK designed & manufactures in Germany 11" HK416, MR556 extended quad rail. This drop in unit offers 2 full inches in extra length. Not the standard 9" rail that comes with the HK 416/MR556 but... , The MR556’s barrel length is ideal for a range of shooting scenarios, from close-quarters engagements to longer-range precision shots. 4. Modular Rail System: The rifle boasts a free-floating quad-rail handguard that allows users to attach accessories such as optics, grips, lasers, and lights. This modular design enables customization to suit ..., HK MR556. A direct descendant of the HK416, the HK MR556 for sale offers impeccable durability, precision, and battle proven reliability. This rifle utilizes a "closed" short stroke …, Mar 4, 2021 · Greetings all. I'm looking for an 11" handguard (picatinny or m-lock; metal or polymer) that will work for an MR556A1 that has a 14.5" barrel... and has an inner diameter of at least 1.6" (4.06cm). The handguard will have to slide over a welded suppressor that has a diameter of 1.58" to allow access to the gas tube and barrel for cleaning ... , HK 416, MR556 Quad Rail- Standard LengthHK416 & MR556 quad rail complete that includes HK 416/MR556 Handguard Screw. This handguard can also be installed on the CR556 models as well... HKP-17963 Out Of Stock. Quick view. HKP HK MR556/416 DMR Extended 15" Quad Rail - Black. HKP HK Parts $259.95. HK MR556 & HK416 DMR …, HK 416 A3 Extended Forearm With Integrated Flip Up Front Sight: HK designed & manufactured in Germany 11" HK416 A5, MR556 extended quad rail. This drop in unit offers 2 full inches in extra length. Not the standard 9" rail that comes with the HK..., Because these genuine article, Heckler & Koch 416/MR556 free-float rail systems are sourced from actual H&K stock of like-new surplus, there MAY be MINOR ..., Sale! HK 416A5 Style Quad Rail Foregrip Handguard Tan/RAL8000 (Blem) $27900Original price was: $27900.$17900Current price is: $17900. SKU: HK416BCGNBLM-1Category: hide-from-searchTags: 416, 416A5, MR556, RAL8000Product ID: 7024. NOTE: Picture of blemish is only a representation, actual product may differ., MR556 Rifle, 5.56mm, Optics Ready - supplied with one magazine, rifle length M-LOK handguard, and medium contour barrel ... MR556 9" quad rail handguard: 379: ..., Quoted: My cousin just picked up his MR556 and he’s wanting a 11 inch quad rail for it. So far we’re striking out besides HK parts and they’re out of stock. View Quote. Search the sale forums, hkpro usually has a few used ones for sale much cheaper than hkparts. Or he could just buy a Geissele and be done with it., HK MR556 Quad Rail. Price $379.00. 236204. Heckler and Koch (HK) HK416 Quad Rail Handguard 11 Inch. Price $419.00. 50233617. Heckler and Koch (HK) KAC HK MP5 RAS Rail, If you’re in the market for a split rail fence, it’s important to find a seller that offers both affordability and reliability. With so many options out there, it can be overwhelmi..., itted to the MR Series. Both HK rail system handguards can be installed and removed with simple tools and return to zero when reinstalled. The MR556A1 also has a Picantinny rail machined into the top of its upper receiver for mounting optics and mechanical sights. Unlike earlier prototypes, major subassemblies, including the MR556A1 upper receiver/, HK MR556 & HK416 DMR Length 15" Quad Rail - Extended HKP-18018 Out Of Stock. Quick view. HKP HK MR556/416 DMR Extended 15" M-LOK Handguard - Black. HKP HK Parts ... HK416, MR556 Replacement Handguard Rail Screw - Hex- Stainless SteelHex head replacement handguard retension screw for your HK416, MR556 forearm. ..., Omaha Outdoors has custom and factory in stock HK MR556 models for sale. ... HK MR556 Quad Rail. Price $379.00. 236204. Heckler and Koch (HK) ... HK MR556 9 Inch Rail ..., HKRM5-130. $399.95. Quantity: Add to Wish List. Description. Additional Information. Rail System - 13.75? - Brown - M-Lok - HK MR556 The New KDG HK 556 M-Lok rails are direct mount rail system, replacing the factory HK 556 rail systems. These new rails are identical in design to their big brother, the KDG HK 762 M-LOK Rail system., Login. HK 416A5 Style Quad Rail Foregrip Handguard Tan/RAL8000. $27900. SKU: HK416BCGN-1-1Categories: 416 417 G28 M110, New Products, Services HK416 MR556Tags: 416, 416A5, MR556, RAL8000Product ID: 5063. HK 416A5 style quad rail foregrip/handguard with built in front sight. Fits HK MR556/416 and all in spec clones., The KDG HK556 rails come in two lengths a 10 inch and 13.75 inch available in black and brown type 3 hard coat anodizing. Specs: Overall length: 13.75 in. Weight: 13.6 oz. Finish: Black anodize type 3 hardcoat. Material: 6061 T6 aircraft grade aluminum. Compatibility: All HK416 variants including 416, MR556, and M27., Heckler Koch MR556 Quad Rail Handguard 236204. SKU 236204-HK. Review this product. Item is out of stock and cannot be backordered. Get notified when Heckler Koch MR556 Quad Rail Handguard 236204 is back in stock. Your Price: $313.99. Financing Available at Checkout. Government Export Restriction ..., Shop Heckler & Koch MR556 Quad Rail Handguard | 5 Star Rating on 1 Review for Heckler & Koch MR556 Quad Rail Handguard + Free Shipping over $49. Toll-Free: +1-800-504-5897 Help Center Check Order Status. About Us Policies Reviews How To. FREE SHIPPING & FREE RETURNS*, HK 416, MR556, & MR762 Quad Rail Picatinny Rail Cover - Black Brand new Heckler & Koch Picatinny rail covers made of high-impact HK polymer. Each rail is equipped with a quick-release tab and marked with the HK logo. Compatible... HKP-01743 $19.95. Add to Cart Compare Quick view. Qty in Cart: 0 ..., HK MR556 416 Adjustable Gas Block For 14.5-16in Barrel $ 419 00. Out of stock. HK416 USMC IAR M27 Long Rail Foregrip RAL8000 ... HK 416D Style N-S Cutout Quad Rail Foregrip Handguard Black $ 199 00. HK 416F Style Ribbed 3 Prong Flash Hider Clone $ 69 00. HK MR556 416 Adjustable Gas Block For 10.5in Barrel, Canada is a beautiful country, and there’s no better way to explore it than by rail. Whether you’re looking for a relaxing ride through the countryside or an exciting adventure thr..., WTS: H&K MR556 A1 w/ 416 Quad Rail and Irons. I got for sale a Heckler and Koch MR556A1. It comes with the original 416 9” Quad Rail like when HK first started selling these models. Also I’m including in some Troy Industries Flip Up iron sights with the listing as well. Fired ~200 rounds., Heckler and Koch HK416 / MR556 9″ Free Floating Quad Rail System for use with Adjustable Gas Block – Factory New. This is a factory original, genuine HK part manufactured in Germany. Heckler and Koch is internationally recognized for their high quality products, commitment to excellence, and their unparalleled, innovation. , Price: $250 shipped/insured via PayPal F&F Sold. HK Germany 416, MR556 Quad Rail - Extended 11”. Purchased new by me a few days ago, only briefly temp-installed without torque or the screw to check clearance and feel, otherwise unused. This transaction has been logged and flairs have been adjusted. Thank you! , SKU: HKP-02546. UPC: 642230247642. MPN: 236204. $0.00. Add to Wish List. Description. Additional Information. HK 416, MR556 Quad Rail- Standard Length. HK …, Buy a HK 416MR556 Quad Rail for sale by Jays Guns and Accessories on GunsAmerica.com the best online marketplace for buying and selling semi auto pistols, firearms, accessories, and collectibles : 917860645, For the new series of Heckler and Koch semi-automatic MR rifles, HK designers and engineers believe best accuracy comes with an unlined bore.”. The MR556A1 features a 16.5” barrel with a 1x7 barrel twist that’s free floated and covered by a removable quad rail. Housed inside the quad rail is the system’s gas piston and push rod.