HK MR556 / 416 Barrels

HK MR556 / 416 Barrels

Upgrade your HK MR556 or HK416 with the ultimate barrel. Choose from genuine HK barrels in various lengths (10.4", 14.5", 16.5"), aftermarket performance options, heavy barrels, and cold hammer forged barrels. 

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  • H&K HK MR556/416 Gas Block Roll Pin

    H&K HK MR556/416 Gas Block Roll Pin

    H&K Heckler & Koch

    $7.95
    HK 416 & MR556 Gas Block Pin This is the retaining pin for an HK 416 gas block. A must-have, as HK recommends using new pins once they are removed or damaged.  Size: 5 x 18 mm.
    HKP-02534
    $7.95
    Qty in Cart: 0
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    $7.95
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  • H&K HK MR556/MR762/416//417 Complete Piston Rod Assembly

    H&K HK MR556/MR762/416//417 Complete Piston Rod Assembly

    H&K Heckler & Koch

    $64.95
    H&K HK MR556, MR762, 416, & 417 Complete Piston Rod Assembly  A great replacement or spare to keep on hand. Compatible With: HK MR556 HK 416 HK 416 A5 MR762 HK 417 Please Note: Does not fit barrels less than 10 inches.
    HKP-00042
    $64.95
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    $64.95
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  • HK Piston 3-Ring Replacement Set

    HK Piston 3-Ring Replacement Set

    H&K Heckler & Koch

    $19.95
    HKP Gas Piston Ring Replacement Combo Set- 3 Rings The gas rings are prone to periodic breakage and wear and tear and require them to be replaced periodically. These are some of the most common breakage parts we see that need to be replaced on these...
    HKP-00048
    $19.95
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  • HKP HK Piston Ring Replacement Set - 3 Ring Combo

    HKP HK Piston Ring Replacement Set - 3 Ring Combo

    HKP HK Parts

    $8.95
    HK MR556, HK416 & G36, SL8 Gas Piston Ring Replacement Combo Set - 3 Rings This is a high wear common repair & replacement item. The gas rings are prone to periodic breakage & wear, tear and require them to be replaced periodically...
    HKP-17933
    $8.95
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    $8.95
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  • Barrel Nut - HK 416, MR556 - Stainless Steel Barrel Nut - HK 416, MR556 - Stainless Steel

    Barrel Nut - HK 416, MR556 - Stainless Steel

    $39.95
    HK MR556, HK 416 Barrel Nut or Socket For Barrel - Stainless Steel A must have repair and replacement part for removal or when you have any work done to your barrel as the barrel nut may become damaged in the removal and installation processes. Made in...
    HKP-17334
    $39.95
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  • HKP (9mm & 5.56/.223) Thread Protector For Barrels - Threaded 1/2x28 HKP (9mm & 5.56/.223) Thread Protector For Barrels - Threaded 1/2x28

    HKP (9mm & 5.56/.223) Thread Protector For Barrels - Threaded 1/2x28

    HKP HK Parts

    $14.95
    HKP (9mm & 5.56/.223) Thread Protector For Barrels - Threaded 1/2x28 A must-have accessory to safeguard the threads on your threaded barrel, this thread protector is the finest available. It is the standard thread protector included with all HKPARTS...
    HKP-02646
    $14.95
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  • H&K HK MR556/416 Vented Slimline Gas Block H&K HK MR556/416 Vented Slimline Gas Block

    H&K HK MR556/416 Vented Slimline Gas Block

    H&K Heckler & Koch

    $135.00
    HK German MR556, 416 Gas Block Complete - Low Profile This part is the factory slim-line, low-profile gas block for the MR556/HK416. There are no bayo lug or sling attachment points. This is the factory-correct gas block found on the MR556...
    HKP-02660
    $135.00
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  • Nefarious Arms HK 416 Reaction Rod Nefarious Arms HK 416 Reaction Rod

    Nefarious Arms HK 416 Reaction Rod

    Nefarious Arms

    $129.95
    Nefarious Arms - Reaction Rod - HK 416  The Nefarious Arms H&K 416 Reaction Rod is used to securely hold the upper receiver in a bench vise so that work may be performed on the muzzle device. It is inserted through the rear of the upper receiver...
    HKP-21272
    $129.95
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  • German HK 416, MR556 - Barrel Nut German HK 416, MR556 - Barrel Nut

    German HK 416, MR556 - Barrel Nut

    H&K Heckler & Koch

    $53.95
    HK MR556 & HK 416 Barrel Nut Or Socket For Barrel All steel barrel nut. This item is a must-have repair and replacement part for removal or when you have any work done to your barrel, as the barrel nut may become damaged in the removal and...
    HKP-02535
    $53.95
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  • Nefarious Arms - NAS HK 416 Adjustable Gas Block Nefarious Arms - NAS HK 416 Adjustable Gas Block

    Nefarious Arms - NAS HK 416 Adjustable Gas Block

    Nefarious Arms

    $549.95
    Nefarious Arms - NAS HK 416 Adjustable Gas Block This is a user configurable 2 position adjustable gas block that can be installed on 11″ – 20″ A1 barrels. Each gas block ships with 5 vent screws, a screwdriver, anti-seize and detailed...
    HKP-21040
    $549.95
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  • H&K HK 416 10.4" Vented Upper Gas Block H&K HK 416 10.4" Vented Upper Gas Block

    H&K HK 416 10.4" Vented Upper Gas Block

    H&K Heckler & Koch

    $279.95
    HK German 10.4" Upper Gas Block Complete New Vented Style New HK German manufacture newest "VENTED" version direct from HK Germany. Great upgrade part for existing 10.4" uppers that have the older style non-vented gas block or to use on the MR556-HK 416...
    HKP-18056
    $279.95
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    HKP 416 10.4" 5.56 Complete Upper Receiver Assembly HKP 416 10.4" 5.56 Complete Upper Receiver Assembly

    HKP 416 10.4" 5.56 Complete Upper Receiver Assembly

    HKP HK Parts

    $2,485.95
    HKP 416 10.4" 5.56 Complete Upper Kit Complete Each kit includes the complete upper assembly, bolt group, tungsten buffer, & high-reliability SS recoil spring. This upper kit is a complete gas piston HK 416 style upper assembly that will drop on your...
    HKP-17662
    $2,485.95
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  • HKP HK MR556/416 Barrel Nut HKP HK MR556/416 Barrel Nut

    HKP HK MR556/416 Barrel Nut

    HKP HK Parts

    $39.95
    HK MR556, HK 416 Barrel Nut Or Socket For Barrel - Aluminum A must have repair and replacement part for removal or when you have any work done to your barrel as the barrel nut may become damaged in the removal and installation processes. Made in the USA...
    HKP-17273
    $39.95
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  • HK G36, HK SL8, HK 416, HK MR556 Gas Piston - Black HK G36, HK SL8, HK 416, HK MR556 Gas Piston - Black

    HK G36, HK SL8, HK 416, HK MR556 Gas Piston - Black

    USA

    $79.95
    HK G36, HK SL8, HK 416, & HK MR556 Gas Piston - Black Complete assembly with 3X rings installed and nitrided black. Counts as one US-made compliant part for your SL8-G36 style conversion. This is one of the best parts to use on the conversion as it...
    HKP-14540
    $79.95
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  • HK 416 10.4" Upper Gas Block - German HK 416 10.4" Upper Gas Block - German

    HK 416 10.4" Upper Gas Block - German

    $279.95
    HK German 10.4" Upper Gas Block Complete New HK German manufacture. This is the ONLY 10.4" gas block available from HK Germany. Compatible With: HK 416 10.4" uppers HK MR556 to 10.4" conversions Please Note: This unit is NOT a vented gas block.
    HKP-01543
    $279.95
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  • HKP HK 416 11.5" 5.56 Complete Upper Receiver Assembly HKP HK 416 11.5" 5.56 Complete Upper Receiver Assembly

    HKP HK 416 11.5" 5.56 Complete Upper Receiver Assembly

    HKP HK Parts

    $2,485.95
    HKP HK 416 11.5" 5.56 Complete Upper Kit Complete HKP 416 style complete upper assembly. This top-tier assembly seamlessly fits onto your mil-spec lower or a STS 416 lower, providing the perfect solution for those seeking an 11.5" 416 style upper without...
    HKP-21539
    $2,485.95
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  • Nefarious Arms HK 416/MR556 10.4" A3 Barrel Nefarious Arms HK 416/MR556 10.4" A3 Barrel

    Nefarious Arms HK 416/MR556 10.4" A3 Barrel

    Nefarious Arms

    $694.95
    Nefarious Arms HK 416/MR556 10.4" A3 Barrel Each Nefarious Arms barrel is cold-hammer-forged and chrome-lined for years of accurate shooting.  Grab this expertly crafted barrel for your next SBR or pistol build.  Proudly made in the...
    HKP-21335
    $694.95
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    $694.95
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  • HKP HK 416 (5.56/.223) A5 Converted Barrel - Threaded 1/2x28 HKP HK 416 (5.56/.223) A5 Converted Barrel - Threaded 1/2x28

    HKP HK 416 (5.56/.223) A5 Converted Barrel - Threaded 1/2x28

    HKP HK Parts

    $588.95
    HKP/H&K 416 (5.56/.223) & A5 Converted Barrel - Threaded 1/2x28 These barrels began as standard A3 style but have been precisely machined with an A5-style relief cut to fit HK 416 & MR223 A5 uppers. Now, you can have a drop-in barrel for your...
    HKP-21449
    $588.95
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    $588.95
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    Nefarious Arms HK 416 Gas Block Assembly Tool Nefarious Arms HK 416 Gas Block Assembly Tool

    Nefarious Arms HK 416 Gas Block Assembly Tool

    Nefarious Arms

    $128.95
    Nefarious Arms HK 416 Gas Block Assembly Tool A Nefarious Arms creation for those that like to service or replace their 416 gas block. This assembly tool will effortlessly help you assemble or disassemble your 416 gas block by simply aligning the two...
    HKP-21273
    $128.95
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    $128.95
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  • Nefarious Arms HK 416/MR556 11" A3 Barrel Nefarious Arms HK 416/MR556 11" A3 Barrel

    Nefarious Arms HK 416/MR556 11" A3 Barrel

    Nefarious Arms

    $694.95
    Nefarious Arms HK 416/MR556 11" A3 Barrel Each Nefarious Arms barrel is cold-hammer-forged and chrome-lined for years of accurate shooting. Grab this expertly crafted barrel for your next SBR or pistol build.  Compatible With: HK 416 (A1, A3, not...
    HKP-21619
    $694.95
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    $694.95
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    Nefarious Arms HK 416/MR556 14.5" A5 Barrel Nefarious Arms HK 416/MR556 14.5" A5 Barrel

    Nefarious Arms HK 416/MR556 14.5" A5 Barrel

    Nefarious Arms

    $694.95
    Nefarious Arms HK 416/MR556 14.5" A5 Barrel Each Nefarious Arms barrel is cold-hammer-forged and chrome-lined for years of accurate shooting.  Grab this expertly crafted barrel for your next SBR or pistol build.  Compatible With: HK 416 (A5,...
    HKP-21590
    $694.95
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    $694.95
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  • Nefarious Arms HK 416 Installation Barrel Nefarious Arms HK 416 Installation Barrel

    Nefarious Arms HK 416 Installation Barrel

    Nefarious Arms

    $154.95
    Nefarious Arms HK 416 Installation Barrel HK416 multitool patterned off a genuine HK 416 wrench with added upgrades Used with a traditional 1/2″ torque wrench or the plug-and-socket style torque wrench that utilizes the ball detent...
    HKP-21487
    $154.95
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    $154.95
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    H&K HK 416 Vented Gas Block for 14.5"/16" Barrels H&K HK 416 Vented Gas Block for 14.5"/16" Barrels

    H&K HK 416 Vented Gas Block for 14.5"/16" Barrels

    H&K Heckler & Koch

    $249.95
    HK German 416, MR556 14.5" & 16.5" & 20" Gas Block Complete This is the factory-correct gas block with the ambi sling attachment points, as well as the bayonet lug milled into the gas block. Perfect for those who want to swap the MR556 gas block...
    HKP-01544
    $249.95
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    $249.95
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    Nefarious Arms HK 416/MR556 14.5" A3 Barrel Nefarious Arms HK 416/MR556 14.5" A3 Barrel

    Nefarious Arms HK 416/MR556 14.5" A3 Barrel

    Nefarious Arms

    $694.95
    Nefarious Arms HK 416/MR556 14.5" A3 Barrel Each Nefarious Arms barrel is cold-hammer-forged and chrome-lined for years of accurate shooting.  Grab this expertly crafted barrel for your next SBR or pistol build.  Compatible With: HK 416 (A1,...
    HKP-21589
    $694.95
    Qty in Cart: 0
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    $694.95
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  • H&K MR556 Slimline Barrel, 16.5" H&K MR556 Slimline Barrel, 16.5"

    H&K MR556 Slimline Barrel, 16.5"

    H&K Heckler & Koch

    $889.95
    Genuine HK MR556 Slimline 16.5" Barrel.  Non-chrome-lined for match accuracy. Compatible With: HK MR556
    HKP-21322
    $889.95
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    $889.95
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  • HKP HK MR556/416 Upper 8" 416C Style Conversion Kit HKP HK MR556/416 Upper 8" 416C Style Conversion Kit

    HKP HK MR556/416 Upper 8" 416C Style Conversion Kit

    HKP HK Parts

    $1,285.95
    MR556 & HK416 Upper Conversion Kit - 8" - HK 416C Style Finally an answer for all of those that have been wanting as close to the original, rare unicorn of a find HK 416C 8" barrel conversion kit for 416 or MR556. Each conversion kit upper or barrel...
    HKP-18629
    $1,285.95
    Qty in Cart: 0
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    $1,285.95
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    H&K HK MR556/416 Titanium Barrel Nut H&K HK MR556/416 Titanium Barrel Nut

    H&K HK MR556/416 Titanium Barrel Nut

    HKP HK Parts

    $99.95
    Titanium HK MR556, HK 416 Barrel Nut Or Socket For Barrel A must have repair and replacement part for removal or when you have any work done to your barrel as the barrel nut may become damaged in the removal and installation processes. Made in the USA...
    HKP-17275
    $99.95
    Qty in Cart: 0
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    $99.95
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    H&K MR556 & HK416 (5.56x45/.223) Upper Conversion Kit - Threaded 1/2x28 H&K MR556 & HK416 (5.56x45/.223) Upper Conversion Kit - Threaded 1/2x28

    H&K MR556 & HK416 (5.56x45/.223) Upper Conversion Kit - Threaded 1/2x28

    HKP HK Parts

    $699.95
    H&K MR556 & HK416 (5.56x45/.223) Upper Conversion Kit - Threaded 1/2x28 Finally an answer for all of those that have been wanting a 14.5" upper for an HK416 or MR556. This conversion kit adds an upper or a barrel option for your MR556, CR556...
    HKP-17877
    $699.95
    Qty in Cart: 0
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    $699.95
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    HKP HK MR556/416 10.4" 5.56 Barrel HKP HK MR556/416 10.4" 5.56 Barrel

    HKP HK MR556/416 10.4" 5.56 Barrel

    HKP HK Parts

    $369.95
    MR556 & HK416 Barrel - 10.4"- US Made Finally an answer for all of those that have been wanting a 10.4" 416 or MR556 barrel option for your MR556, CR556 & HK 416's. Each barrel is as close as you can get for those that want a HK 416 style upper...
    HKP-18200
    $369.95
    Qty in Cart: 0
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    $369.95
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    HKP HK MR556/416 9" HK416C Style Barrel Conversion Kit HKP HK MR556/416 9" HK416C Style Barrel Conversion Kit

    HKP HK MR556/416 9" HK416C Style Barrel Conversion Kit

    HKP HK Parts

    $0.00
    MR556 & HK416 Barrel Conversion Kit - 9" - HK 416C Style Finally an answer for all of those that have been wanting as close to the original, rare unicorn of a find HK 416C 9" barrel conversion kit for 416 or MR556. Each conversion kit upper or barrel...
    HKP-18401
    $0.00
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    $0.00
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    HKP HK MR556/416 Upper 9" 416C Style Conversion Kit HKP HK MR556/416 Upper 9" 416C Style Conversion Kit

    HKP HK MR556/416 Upper 9" 416C Style Conversion Kit

    HKP HK Parts

    $899.95
    MR556 & HK416 Upper Conversion Kit - 9" - HK 416C Style Finally an answer for all of those that have been wanting as close to the original, rare unicorn of a find HK 416C 9" barrel conversion kit for 416 or MR556. Each conversion kit upper or barrel...
    HKP-18674
    $899.95
    Qty in Cart: 0
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    $899.95
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