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.
AR Upper Parts
RRA CMPLT MID A4 UPR 450BM 16″ 5RD
$751.00
RRA CMPLT MID A4 UPR 450BM 16″ 5RD
Availability: Only 2 left in stock
Rock River Arms
| Weight | 2 lbs |
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| Dimensions | 12 × 6 × 4 in |
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