Fits inside and fills the magazine well to help prevent distortion caused by vise pressure.
SPECS: 7075 aircraft aluminum, silver, matte finish. 1911 Auto available Standard (Std) 4" (10.2cm) long and Extended (Ext) 5" (12.7cm) long. Double-Stack models are Extended (Ext) 8" (20cm) long only. STI fits STI, SVI and McCormick.
Catalog page 135