Rock River Arms
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Rra Cmp Coyote Car A4 Upr 300blk 16
Rock River Arms
$753.21Rock River Arms A4 Coyote Carbine upper comes chambered in .300 AAC / Blackout with a 16" chrome moly 1/8twist barrel. Additionally this upper includes a RRA 12.5" M-Lok compatible lightweight free...$753.21 -
Rra Cmplt Car A4 Upr 350lgd 16" 10rd
Rock River Arms
$678.57Rock River Arms A4 Carbine upper comes chambered in .350 Legend with a 16" chrome moly 1/16 twist barrel. Additionally this upper includes a RRA 13" M-Lok compatible lightweight free float rail and a...$678.57 -
Rra Cmplt Car A4 Upr 458 Socom 16
Rock River Arms
$726.07Rock River Arms complete Tactical Carbine upper is an A4 upper chambered in .458 SOCOM with a 16" chrome moly bull barrel and 1:14 twist. Additionally the upper comes with a complete bolt carrier...$726.07 -
Rra Cmplt Mid A4 Upr 450bm 16" 5rd
Rock River Arms
$692.14Rock 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...$692.14