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/MR762/416//417 Complete Piston Rod Assembly
H&K Heckler & Koch
$64.95H&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 Does not fit barrels less than 10 inches.HKP-00042$64.95 -
Barrel Nut - HK 416, MR556 - Stainless Steel
$39.95HK 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 -
HK 416 10.4" Upper Gas Block - German
$279.95HK 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 10.4" uppers HK MR556 to 10.4" conversions Please note: This unit is NOT a vented gas block.HKP-01543$279.95 -
German HK 416, MR556 - Barrel Nut
H&K Heckler & Koch
$45.00HK 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 & installation...HKP-02535$45.00 -
H&K HK MR556/416 Barrel Nut
HKP HK Parts
$39.95HK MR556, HK 416 Barrel Nut Or Socket For Barrel - AluminumA 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 -
Out Of Stock
HKP HK 416C 9" Complete Upper Kit
HKP HK Parts
$2,799.95HK416C Complete Upper Kit - 9" After years trying to get these back in. We finally bring you a rare unicorn of a find. With our complete 416c upper kit all that would be needed to complete this kit would be a mil-spec lower or a STS 416c lower...HKP-21042$2,799.95 -
Out Of Stock
H&K HK 416 Vented Gas Block for 14.5"/16" Barrels
H&K Heckler & Koch
$249.95HK 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 -
Nefarious Arms - NAS HK 416 Adjustable Gas Block
Nefarious Arms
$549.95NA5 Gas Block from Nefarious Arms Adjustable 2 Position 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...HKP-21040$549.95 -
HKP 416 10.4" 5.56 Complete Upper Kit Complete
HKP HK Parts
$2,485.95HKP 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 -
Nefarious Arms HK 416 Gas Block Assembly Tool
Nefarious Arms
$128.95Nefarious Arms HK 416 Gas Block Assembly Tool A Nefarious Arms creation for those that like to service or replace thier 416 gas block. This assembly tool will effortlessly help you assemble or disassemble your 416 gas block by simply alinging the...HKP-21273$128.95 -
Nefarious Arms HK 416 Reaction Rod
Nefarious Arms
$129.95Nefarious 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...HKP-21272$129.95 -
Nefarious Arms HK 416/MR556 10.4" A3's Barrel
Nefarious Arms
$694.95Nefarious Arms HK 416/MR556 10.4" A3 Barrel Chrome-lined and made in the USA. Grab this expertly crafted barrel for your next SBR or pistol build.HKP-21335$694.95 -
H&K MR556 Slimline Barrel, 16.5"
H&K Heckler & Koch
$889.95Genuine HK MR556 Slimline 16.5" Barrel. Non-chrome-lined for match accuracy. Compatible With: HK MR556HKP-21322$889.95 -
Out Of Stock
H&K HK 416 10.4" Vented Upper Gas Block
H&K Heckler & Koch
$0.00HK German 10.4" Upper Gas Block Complete New Vented StyleNew 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$0.00 -
Out Of Stock
H&K HK MR556/416 Titanium Barrel Nut
HKP HK Parts
$99.95Titanium HK MR556, HK 416 Barrel Nut Or Socket For BarrelA 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 -
Out Of Stock
HKP HK MR556/416 10.4" .556 Barrel
HKP HK Parts
$369.95MR556 & HK416 Barrel - 10.4"- USAPLEASE NOTE THIS OFFERING IS THE HK 416 10.4" BARREL ONLY! UPDATES PICS OF THE BARREL ARE COMING SOON! THE PICTURES SHOW A COMPLETE UPPER KIT HOWEVER THIS THE LISTING FOR THE BARREL WITH BARREL EXTENSION INSTALLED...HKP-18200$369.95 -
Out Of Stock
HKP HK MR556/416 9" HK416C Style Barrel Upper Conversion Kit
HKP HK Parts
$0.00MR556 & HK416 Upper Conversion Kit - 9" - HK 416C StyleFinally an answer for all of those that have been wanting as close to the origional, 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