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The HK recoil pad fits the MR556A1, MR762A1, HK 416 and 417.

Barrel nut for MR556A1 rifle

Receiver extension nut for MR556 rifle

Cam pin for MR556 and HK416 rifles

Concave Butt Cap for MR556 and MR762 rifles

Originally designed for the US military’s SOPMOD rifle enhancement program, the KAC M4 Folding Front Sight is a low-profile backup sighting solution that is designed to be attached to the top rail of a rifle’s handguard. When stowed in the folded position, the M4’s sight base extends back to envelope the front sight leaf on the right and left side, helping to protect it from damage.

Barrel nut for MR556 A4 and HK416 A5 rifle

This kit includes a complete upper receiver/barrel assembly, allowing Mil-Spec 5.56mm AR-style rifles to be retrofitted to HK’s piston and pusher rod system. This system utilizes a piston and a pusher rod in place of the gas tube normally found in AR15/M16/M4-style rifles. This closed system virtually eliminates the malfunctions that are common in direct-impingement gas systems, since hot carbon fouling and waste gasses are not propelled into the receiver area to operate the action. This is the same key feature critical to the success of the HK416 used by elite military and law enforcement customers. Upper will ship in HK Soft case.

This kit includes a complete upper receiver/barrel assembly, allowing Mil-Spec 5.56mm AR-style rifles to be retrofitted to HK’s piston and pusher rod system. This system utilizes a piston and a pusher rod in place of the gas tube normally found in AR15/M16/M4-style rifles. This closed system virtually eliminates the malfunctions that are common in direct-impingement gas systems, since hot carbon fouling and waste gasses are not propelled into the receiver area to operate the action. This is the same key feature critical to the success of the HK416 used by elite military and law enforcement customers. Upper will ship in HK Soft case.

Gas block for MR556 rifle

30rd magazine fits HK33, HK53, and HK93 rifles

Designed for precision and adaptability, The MR556 quick detach handguard features a Picatinny rail at the 12 o clock position for seamless mounting of optics and accessories. Additionally, M-LOK slots at the 3, 6, and 9 o'clock positions provide enhanced modularity for attachments such as grips, lights, and lasers. Engineered for practicality, the handguard includes two QD sling swivel cups, one on each side, ensuring ambidextrous sling mounting options for enhanced maneuverability. Compatible with both MR556 A4 and MR556 A1 models, this handguard offers the perfect blend of functionality and compatibility for tactical or competitive shooting. Built for reliability, this handguard is an essential upgrade for maximizing the performance of your MR556 rifle.

Designed for precision and adaptability, The MR556 quick detach handguard features a Picatinny rail at the 12 o clock position for seamless mounting of optics and accessories. Additionally, M-LOK slots at the 3, 6, and 9 o'clock positions provide enhanced modularity for attachments such as grips, lights, and lasers. Engineered for practicality, the handguard includes two QD sling swivel cups, one on each side, ensuring ambidextrous sling mounting options for enhanced maneuverability. Compatible with both MR556 A4 and MR556 A1 models, this handguard offers the perfect blend of functionality and compatibility for tactical or competitive shooting. Built for reliability, this handguard is an essential upgrade for maximizing the performance of your MR556 rifle.

Ambi charging handle for MR556 A4

Fits the HK416, MR556A1 and the MR762A1.

The HK grip can be used with all MR556, MR762, HK416 and HK417.

Incomplete gas block for MR556 A4

Fits: MR556A1, MR762A1, HK416 (10,14.5, 16.5, 20 inch barrel lengths), HK417 (12, 16 inch barrel lengths). Use with rear drum sight 227635, 233197.

The HKE1 Buttstock fits MILSPEC buffer tubes (receiver extensions) for M4/AR15 – type weapons.

Front fixed sight for HK MR556, MR762A1, HK416 and other AR-15/M-16 platforms. Used with Rotary Rear Sight.