Rock River Arms A4 mid-length upper comes chambered in .450 Bushmaster with a 16" chrome moly 1/24 twist barrel. Additionally this upper includes a RRA 13" M-Lok compatible lightweight free float rail and a RRA Operator Brake (5/8-32 thread). This is a complete upper with bolt carrier group, charging handle assembly and a 5 round magazine.
- Accessories:
- 1 Magazine
- Barrel Length:
- 16";Capacity=5 Rounds"
- Finish:
- Anodized
- Fit:
- AR-15
- Caliber:
- 450 Bushmaster
- Manufacturer:
- Rock River Arms
- Manufacturer Part No.:
- 450B0592
- Model:
- Tactical Carbine
- Type:
- Upper
- Sub Category:
- Complete Upper Receivers
- Color:
- Black
- Prop 65 Warning:
- Prop65: WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
