Adjustable Bolt System Mainspring - Extra Heavy

Adjustable Bolt System Mainspring - Extra Heavy

$12.00

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SKU:: 065-1sr
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CAR mainspring to be used with higher pressure .45acp and 7.62x25 ammo to reduce cyclic rate. This spring should not be used with the 9mm setup.

STG Universal U7.62, U45, & STG 7.62

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