Additional coils provide precise magazine tuning for reliable feeding. Helps solve feeding problems encountered with high capacity magazines equipped with hollow base pads for additional rounds. High-quality, tempered music wire springs are 10% increased power. STI/Infinity/McCormick - 38 fits .38 Super, 9x21mm, 9x23mm. .45 fits .40 cal., .45 ACP. Para-Ordnance - Fits all calibers. P12, P13, P14, P16, cut coils to fit. 1911 Auto 10-round - Fits all calibers of 10-round single stack 1911 Auto.
SPECS: 1, 3 or 10 paks. Installation requires fitting.
Catalog page 113