BLACK RIFLE ARMS
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5.45x39 Spartan Piston Upper   5.45x39 Spartan Piston Upper
$749.99
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5.45x39 Spartan Piston Upper with Troy FDE Alpha Rail
$899.99
5.45x39 Spartan Piston Upper with Troy FDE Bravo Rail
$909.99

BLACK RIFLE ARMS PATENTED GAS PISTON SYSTEMS

C.A.P.S. is our Combat Adaptive Piston System. C.A.P.S. is a 4 position rapid adjustment 

piston system which requires no tool or detent pin to adjust gas regulator.