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Extra power springs wound from aerospace spec chrome silicon wire
****GEN 4 Pistols will require Glock adapter****
Post winding processing consisting of heat treat/stress relieve
ISMI rods are machined from stainless steel
For use in model 20 and 21 pistols
AR-15 30rd. Magazine Spring Sig Extra power springs wound fromExtra power springs wound from aerospace spec chrome silicon wire. Post winding processing consisting of heat treat stress relieve. Designed for use with MagPul and most mil spec followers. For use in 30rd AR 15 magazines. Part#: 15 30
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