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2011 Magazine Spring 170mm SigManufactured from Chrome Silicon alloy these springs are designed to take less initial set to enable a more stable load and increased service life. This 13coil spring is meant for use in STI SVI magazines up to 170mm.
Post winding processing consisting of heat treat/stress relieve
Designed for use with ISMI G17 flatwire springs
and 20lb variants
Designed for use with ISMI’s single flatwire springs
****Requires adapter****
Extra power springs wound from aerospace spec chrome silicon wire
Part #’s:
Unlike other weights on the market
This 11coil spring is meant for use in STI/SVI magazines up to 140mm
****Springs available in 15 and 17lb variants
****Springs available in 12
For use in model 20 and 21 pistols