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 Heckler & Koch
$4.95HK 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$4.95 -
H&K HK MR556/MR762/416/417 Complete Piston Rod Assembly
H&K Heckler & Koch
$109.95H&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 MR762 HK 417 Please Note: Does not fit barrels less than 10 inches.HKP-00042$109.95 -
HK Piston 3-Ring Replacement Set
H&K Heckler & Koch
$19.95HKP 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 -
HKP HK Piston Ring Replacement Set - 3 Ring Combo
HKP HK Parts
$8.95HK 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 -
H&K HK MR556/MR762/416/417/G36/SL8 Complete Gas Piston
H&K Heckler & Koch
$50.95H&K HK MR556/MR762/416/417/G36/SL8 Complete Gas Piston New HK German gas piston assembly with three locking piston rings installed. This is a great spare part to have on hand, as the gas piston takes a lot of wear and tear. Compatible With: HK...HKP-00047$50.95 -
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 -
German HK 416, MR556 - Barrel Nut
H&K Heckler & Koch
$53.95HK 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 -
H&K HK MR556/416 10.4" Vented Upper Gas Block
H&K Heckler & Koch
$279.95H&K HK MR556/416 10.4" Complete Vented Upper Gas Block 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 and HK...HKP-18056$279.95 -
H&K HK MR556/416 Vented Slimline Gas Block
H&K Heckler & Koch
$135.00HK 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 -
Out Of Stock
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 receiver...HKP-21272$129.95 -
Nefarious Arms - NAS HK 416 Adjustable Gas Block
Nefarious Arms
$549.95Nefarious 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 -
HKP HK MR556/416 Barrel Nut
HKP HK Parts
$39.95HK 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 -
HK G36, HK SL8, HK 416, HK MR556 Gas Piston - Black
USA
$79.95HK 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 -
Out Of Stock
HKP HK 416 11.5" 5.56 Complete Upper Receiver Assembly
HKP HK Parts
$2,485.95HKP 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 -
Out Of Stock
HKP 416 10.4" 5.56 Complete Upper Receiver Assembly
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 -
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 416 10.4" uppers HK MR556 to 10.4" conversions Please Note: This unit is NOT a vented gas block.HKP-01543$279.95 -
Nefarious Arms HK 416/MR556 10.4" A3 Barrel
Nefarious Arms
$694.95Nefarious Arms HK 416/MR556 10.4" A3 Barrel ***THE BARREL EXTENSION RIM IS MARKED "HAUS" DUE TO AN ERROR BY THE BARREL EXTENSION SUPPLIER. THE MARKING IS NOT VISIBLE ONCE INSTALLED. THESE BARRELS ARE GENUINE NEFARIOUS BARRELS AS NEFARIOUS...HKP-21335$694.95 -
H&K HK MR556/416 Titanium Barrel Nut
HKP HK Parts
$99.95Titanium 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 -
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 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 -
Nefarious Arms HK 416/MR556 11" A3 Barrel
Nefarious Arms
$694.95Nefarious Arms HK 416/MR556 11" A3 Barrel ***THE BARREL EXTENSION RIM IS MARKED "HAUS" DUE TO AN ERROR BY THE BARREL EXTENSION SUPPLIER. THE MARKING IS NOT VISIBLE ONCE INSTALLED. THESE BARRELS ARE GENUINE NEFARIOUS BARRELS AS NEFARIOUS WILL...HKP-21619$694.95 -
Nefarious Arms HK 416 Installation Barrel
Nefarious Arms
$154.95Nefarious 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 -
HKP HK 416 (5.56/.223) A5 Converted Barrel - Threaded 1/2x28
HKP HK Parts
$588.95HKP/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 -
Out Of Stock
Nefarious Arms HK 416/MR556 14.5" A3 Barrel
Nefarious Arms
$694.95Nefarious Arms HK 416/MR556 14.5" A3 Barrel ***THE BARREL EXTENSION RIM IS MARKED "HAUS" DUE TO AN ERROR BY THE BARREL EXTENSION SUPPLIER. THE MARKING IS NOT VISIBLE ONCE INSTALLED. THESE BARRELS ARE GENUINE NEFARIOUS BARRELS AS NEFARIOUS...HKP-21589$694.95 -
Out Of Stock
Nefarious Arms HK 416/MR556 14.5" A5 Barrel
Nefarious Arms
$694.95Nefarious 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 -
HKP HK MR556/416 10.4" 5.56 Barrel
HKP HK Parts
$369.95MR556 & 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 -
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 -
H&K MR556 Slimline Barrel, 16.5"
H&K Heckler & Koch
$779.95Genuine HK MR556 Slimline 16.5" Barrel. Non-chrome-lined for match accuracy. Compatible With: HK MR556HKP-21322$779.95 -
H&K HK MR556 A4 Gas Block - Complete
H&K Heckler & Koch
$559.95H&K HK MR556 A4 Gas Block - Complete The H&K MR556 A4 adjustable gas block complete system is the ultimate upgrade designed for the HK MR556 A4, providing superior performance for suppressed fire scenarios. With its effortless adjustment from...HKP-21928$559.95 -
Out Of Stock
HKP HK MR556/416 Upper 8" 416C Style Conversion Kit
HKP HK Parts
$1,285.95MR556 & 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 -
Out Of Stock
H&K HK MR556 A4/A5 11" Barrel
H&K Heckler & Koch
$889.95H&K HK MR556 A4/A5 11" Barrel This 11" factory H&K MR556 A4 barrel is built for compact performance without compromising durability or accuracy. Cold hammer-forged, it’s made to Heckler & Koch’s stringent standards and is ideal...HKP-21932$889.95 -
H&K HK MR556/HK 416 A4/A5 Barrel Nut
H&K Heckler & Koch
$99.95H&K HK MR556 A4/HK 416 A5 Barrel Nut This precision-machined steel barrel nut is designed specifically for H&K’s MR556 A4 and HK416 A5 rifles. It secures the barrel and supports the proprietary HK free-floating handguard system, offering...HKP-21938$99.95 -
H&K MR556 A4/416 A5 1.9mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.9mm Gas Vent Screw German 1.9mm gas vent screw for MR556 A4. Provides more venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22050$29.95 -
H&K HK MR556 A4 16.5" Barrel
H&K Heckler & Koch
$779.95H&K HK MR556 A4/A5 16.5" Barrel This 16.5" factory H&K MR556 A4 barrel is cold hammer-forged from high-quality steel for exceptional durability, accuracy, and longevity. Manufactured to Heckler & Koch’s exacting standards, it features a...HKP-21931$779.95 -
H&K HK MR556 A4 Gas Block
H&K Heckler & Koch
$187.00H&K HK MR556 A4 Gas Block The H&K HK MR556 A4 Gas Block is a high-quality, precision-machined component designed for the MR556 A4 rifle. It houses the gas system that directs gas from the barrel to cycle the action. Compatible With: HK MR556 A4HKP-22087$187.00 -
On Sale
H&K HK MR556/416 Gas Block Roll Pin - BLEMISHED
H&K Heckler & Koch
Now: $2.95Was: $4.95H&K HK MR556/416 Gas Block Roll Pin - BLEMISHED COSMETICALLY BLEMISHED PARTS ARE FULLY FUNCTIONAL AND SOLD AS IS. THIS PART IS NOT ELIGIBLE FOR RETURN. ALL BLEMISHED PART SALES ARE FINAL. This is the retaining pin for an HK 416 gas block...HKP-02534-BNow: $2.95Was: $4.95 -
Out Of Stock
H&K MR556 & HK416 (5.56x45/.223) Upper Conversion Kit - Threaded 1/2x28
HKP HK Parts
$699.95H&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 -
H&K MR556 A4/416 A5 1.0mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.0mm Gas Vent Screw German 1.0mm gas vent screw for MR556 A4. Provides less venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22040$29.95 -
H&K MR556 A4/416 A5 1.1mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.1mm Gas Vent Screw German 1.1mm gas vent screw for MR556 A4. Provides less venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22041$29.95 -
H&K MR556 A4/416 A5 1.2mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.2mm Gas Vent Screw German 1.2mm gas vent screw for MR556 A4. Provides less venting than the factory-installed 1.3mm screw. Compatible With: HK MR556 A4 HK416 A5HKP-22043$29.95 -
H&K MR556 A4/416 A5 1.3mm Gas Vent Screw
H&K Heckler & Koch
$29.95H&K MR556 A4/416 A5 1.3mm Gas Vent Screw The 1.3mm gas vent screw is the standard size installed at the factory on the MR556 A4. Compatible With: HK MR556 A4HKP-22044$29.95