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.
| Item # | RSR|RRA450B0592 |
|---|
| Available Colors | Black |
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All firearms must be transferred through a licensed FFL dealer. We cannot ship firearms directly to you — the firearm will be shipped to your local FFL dealer who will complete the transfer.
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