After overwhelming requests to solve the ever growing problem of forgotten magazines, Andrew Bobro of Bobro Engineering, designed the F.N.G.R. to prevent misplacement of your magazine. F.N.G.R. is designed to retain your firearm's magazine in the confines of your lower receiver to prevent loss or theft.
Fits on most AR-15/AR-10 style rifles and most firearms utilizing a standard AR-15 magazine catch. Billet and AR-10 lowers may require fitting due to smaller recesses in the magazine well found in these types of lowers.