Nefarious Arms
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On Sale
HK 416, MR556, G36, SL8 Gas Piston
Nefarious Arms
Now: $67.45Was: $74.95Nefarious Arms HK G36/SL8/HK 416/MR556 Gas Piston A great spare, upgrade, or replacement part for your HK. Includes 3 piston rings for a complete drop in replacement part. TiN coated gold for added...Now: $67.45Was: $74.95 -
On Sale
HK416 A5, MR556 A3 Barrel Nut
Nefarious Arms
Now: $35.96Was: $39.95Nefarious Arms HK MR556 A3/416 A5 Barrel Nut Whether replacing a barrel nut or sourcing the best parts for your build, the Nefarious MR556/416 barrel nut is an excellent option. Meticulously...Now: $35.96Was: $39.95 -
On Sale
HK416 A5, MR556 A4 Barrel - 5.56 - 11" - Threaded 1/2"x28 - A5
Nefarious Arms
Now: $535.46Was: $594.95Nefarious Arms HK MR556/HK416 11" A5 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...Now: $535.46Was: $594.95 -
On Sale
HK416 Barrel Multi Tool
Nefarious Arms
Now: $112.45Was: $124.95Nefarious Arms HK 416 Barrel Installation and Multi Tool HK416 multitool patterned off a genuine HK 416 wrench with added features. Use with a traditional 1/2″ torque wrench or the...Now: $112.45Was: $124.95 -
On Sale
HK416 Gas Block Assembly Tool
Nefarious Arms
Now: $85.45Was: $94.95Nefarious 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...Now: $85.45Was: $94.95 -
HK416, G38 Gas Block for 11-20" A1 Barrels - NA5 Adjustable
Nefarious Arms
$374.95Nefarious Arms - NA5 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...$374.95 -
On Sale
HK416, MR556 Barrel - 5.56 - 9" - Threaded 1/2"x28 - PDW - A1 and A3
Nefarious Arms
Now: $535.46Was: $594.95Nefarious Arms HK 416C 9" Barrel The Nefarious Arms HK416/MR556 Barrel is built for shooters who demand precision, durability, and consistent performance. Made in the USA from 4150 chromoly steel,...Now: $535.46Was: $594.95 -
On Sale
HK416, MR556 Barrel - 5.56 - 10.4" - Threaded 1/2"x28 - A3
Nefarious Arms
Now: $535.46Was: $594.95Nefarious 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...Now: $535.46Was: $594.95 -
On Sale
HK416, MR556 Barrel - 5.56 - 10.4" - Threaded 1/2"x28 - A5
Nefarious Arms
Now: $535.46Was: $594.95Nefarious Arms HK MR556416 10.4" A5 Barrel An expertly crafted 10.4" barrel designed for the HK MR556 and 416 platforms. Featuring the A5 profile, this barrel balances durability and weight, making...Now: $535.46Was: $594.95 -
On Sale
HK416, MR556 Barrel - 5.56 - 11" - Threaded 1/2"x28 - A3
Nefarious Arms
Now: $535.46Was: $594.95Nefarious 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...Now: $535.46Was: $594.95 -
Out Of StockOn Sale
HK416, MR556 Barrel - 5.56 - 14.5" - Threaded 1/2"x28 - A5
Nefarious Arms
Now: $535.46Was: $594.95Nefarious 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...Now: $535.46Was: $594.95 -
On Sale
HK416, MR556 Barrel - 5.56 - 14.5" - Threaded 1/2"x28- A3 - Light
Nefarious Arms
Now: $535.46Was: $594.95Nefarious 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...Now: $535.46Was: $594.95