Make the quick switch to a 5.56mm carbine with this RESOLUTE® Mk4 Upper Group. This upper group does NOT include BCG or charging handle.
Caliber: 5.56mm
Barrel: 16.1"
Twist Rate: 1:8"
Thread Pitch: 1/2x28
Internal Reference:
55BB40B-AB
Barcode:
810103473461
| Brand: CMMG |
| Model: AR-15, Mk4 |
| Caliber: 5.56mm |
| Part Type: Upper Receivers |
| Barrel Length: 16", 16" - 36", 6" - 16" |
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