TGF (Trigger Guard, Forward Controls) Winter, BLK is machined from 7075 aluminum and Type III anodized black, it does not have a spring-loaded detent for the front, but use a set screw like Magpul's, and a standard trigger guard roll pin in the rear. We retained the use of roll pin for TGF's rear, as it's reliable and robust, it also will not loosen. The front set screw is flush with the receiver and doesn't protrude. Both versions feature a canted front edge to make rocking the magazine into the mag well easier. The winter version has as much constant/unchanged space from the trigger bow forward as possible (instead of the space inside tapering and decreasing as the Mfg: Forward Controls Design Llc