Aim Sports PJARSTKCB Stock Lock Pin M4 Steel Black
http://www.tandktactical.com/shop/815879018038-aim-sports-pjarstkcb-stock-lock-pin-m4-steel-black-4688
http://www.tandktactical.com/web/image/product.template/4688/image_1920?unique=bb5f6db
The M4 Stock Lock Pin is designed for use with California featureless buttstock configuration.
