H&K Heckler & Koch

H&K HK MR556A1 and A4 Complete Bolt Group Complete semi-auto bolt carrier group for MR556A1/A4 receivers. Bolt carriers will be marked ".223 Rem" or "5.56 x 45".  Includes The...

H&K MR556 A4 13.4" Complete QD Handguard Genuine H&K MR556 A4 quick detach handguard has a Picatinny rail at 12 o’clock, M-LOK slots at 3, 6, and 9 o’clock, and two QD sling...

H&K HK MR556 A4 Ambi Charging Handle Upgrade your MR556 or HK416-style rifle with this factory H&K ambidextrous charging handle, designed for smooth, reliable operation from either side...

H&K HK MR556 A4 Complete Upper w F/A Ejection Door The H&K MR556 A4 Complete Upper is a superior factory assembly that comes fully equipped with a forward assist and an ejection port door,...

H&K HK MR556 A4 Gas Block - Complete Factory HK MR556 A4 adjustable gas block ideal for switching between suppressed and unsuppressed firing.   Compatible With: HK MR556 A4 Nefarious...

H&K HK MR556 A4 Gas Block - Incomplete 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...

Heckler and Koch Hammer for HK MR556 Semi-Auto rifles Factory-original German steel hammer for MR556 A4 rifles. Designed as a direct replacement for worn or damaged hammers in MR556 A1 and A4 trigger...

H&K MR556 A4 Hammer Spring Genuine H&K hammer spring for the MR556 A4. Compatible With: HK MR556 A4

H&K HK MR556 A4 10" Handguard This 10" factory H&K MR556 A4 handguard offers a lightweight, free-floating design that enhances accuracy and provides rock-solid mounting for accessories. Made...

H&K HK MR556 A4 13.4" Handguard This handguard is expertly engineered for precision and adaptability, featuring a robust Picatinny rail at the 12 o'clock position that guarantees seamless...

HK MR556 A4 Operator's Manual Official operator's manual for the HK MR556 A4, covering function, maintenance, and safety procedures.

H&K Heckler & Koch MR556 Upper Receiver Kit A4 -11″ - M-LOK  This kit includes a complete upper receiver/barrel assembly, allowing Mil-Spec 5.56mm AR-style rifles to be retrofitted...