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HK 51000385 MR556 Upper Receiver Kit 5.56mm for AR15/M16/M4
HK 51000385 MR556 Upper Receiver Kit 5.56mm for AR15/M16/M4
$2,179.00
Out of stock
Disclaimer: It is the customer’s responsibility to ensure that all orders comply with applicable local and federal regulations. Non-compliant orders are subject to a 30% restocking fee. We reserve the right to dispute any chargebacks related to such orders.
This kit includes a complete upper receiver/barrel assembly, allowing Mil-Spec 5.56mm AR-style rifles to be retrofitted to HKs 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.
Your Trusted Online Firearms Store – Shop with Confidence!
Looking for the best prices on HK 51000385 MR556 Upper Receiver Kit 5.56mm for AR15/M16/M4 by Heckler & Koch / H&K? ADA Armaments LLC proudly serves Boise with unbeatable pricing, expert service, and exclusive rewards.
Best Prices in Boise.
Earn Rewards on Every Purchase.
Special Bundles & Firearm Packages Available.
Safe & Secure Checkout – Shop with confidence using trusted payment options.
Compliance-Ready – All sales follow federal, state, and local firearm laws.
No shipping to California.
Limited Stock – Visit Us Today or Shop Online Before They’re Gone!Â
| UPC | 642230270220 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 51000385 |
| Action | .223 REM/5.56 NATO |
| Barrel Finish | Stainless |
| Barrel Length | 11" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Length | 31.1000 |
| Model | MR556 A4 Upper Receiver |
| Package Height | 4.0 |
| Package Width | 13.0 |
| Product Type | Accessory-Uppers |
| Rate of Twist | 1-in-7" |
| Shipping Weight | 8.8 |
This kit includes a complete upper receiver/barrel assembly, allowing Mil-Spec 5.56mm AR-style rifles to be retrofitted to HKs 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.
Your Trusted Online Firearms Store – Shop with Confidence!
Looking for the best prices on HK 51000385 MR556 Upper Receiver Kit 5.56mm for AR15/M16/M4 by Heckler & Koch / H&K? ADA Armaments LLC proudly serves Boise with unbeatable pricing, expert service, and exclusive rewards.
Best Prices in Boise.
Earn Rewards on Every Purchase.
Special Bundles & Firearm Packages Available.
Safe & Secure Checkout – Shop with confidence using trusted payment options.
Compliance-Ready – All sales follow federal, state, and local firearm laws.
No shipping to California.
Limited Stock – Visit Us Today or Shop Online Before They’re Gone!Â
| UPC | 642230270220 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 51000385 |
| Action | .223 REM/5.56 NATO |
| Barrel Finish | Stainless |
| Barrel Length | 11" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Length | 31.1000 |
| Model | MR556 A4 Upper Receiver |
| Package Height | 4.0 |
| Package Width | 13.0 |
| Product Type | Accessory-Uppers |
| Rate of Twist | 1-in-7" |
| Shipping Weight | 8.8 |
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