In selecting a spring for your rifle, install a heavier spring if you feel the buffer head fully compress and bottom out while firing the weapon. If the bolt carrier will not lock back reliably on the last round fired, even when completely gassed (in the case of an adjustable gas block), select a lighter spring.
In particular, if you have an ambidextrous bolt catch extension installed (e.g., the Magpul BAD lever), this extra mass on the bolt catch, in combination with the faster bolt velocity using the SCS with a heavier spring, may cause the bolt to ride over the catch before it has time to engage. In this case, a lighter spring should remedy the problem.
The included springs from lightest to heaviest are listed below with the color with which they are coded:
JPSCS-SPRING15-80: 1 side white
JPSCS-SPRING15-85: 1 side black
JPSCS-SPRING15-90: 1 side green
JPSCS-SPRING15-95: 1 side yellow
JPSCS-SPRING15-100: no color
One spare guide rod retainer screw is also included in case of thread stripping during disassembly.
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