Complete Upper Receivers
HK UPPER MR556A4 5.56 16.5" BLK
Heckler & Koch, MR556 A4 Upper Receiver, 223 Remington/5.56 NATO, 16.5" Barrel, Threaded 1/2X28, M-LOK Handguard, Anodized Finish, Black, Fits AR-15 Lower Receivers, Includes Bolt Carrier Group, Charging Handle, Buffer Weight and Buffer Spring
| Attributes |
| Barrel Length |
16.5" |
| Caliber |
556NATO |
| Color |
Black |
| Finish |
Anodized |
| Fit |
AR-15 |
| Manufacturer Part # |
51000384 |
| Model |
MR556 A4 Upper Receiver |
| Subcategory |
Complete Upper Receivers |
| Type |
Upper |
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