Compatible with Magpul MOE, CTR, SL, ACS, STR Series Stocks Tough solid steel construction ensures quality Simple installation with Magpul style butt stocks Replaces original spring and tension assembly 1:1 Swap with the OEM Magpul pin Securely positions in stock for a seemless fit Designed for use with California Featureless butt stock configuration In the Box 1X Stock Lock Pin Specifications: Brand AIM Sports Build Steel Function Stock Lock Pin Weight 0.10 oz Compatibility Magpull Series Butt Stocks Color STEEL California Proposition 65 Warning: Cancer and Reproductive Harm - www.P65Warnings.ca.gov