The L-A1 is a full-size, double-stack, striker-fired, polymer-frame pistol. It’s available in .40 S&W, .357 Sig, and 9mm. Mine is a 9mm, and its metal magazine holds 17 cartridges. The .40 S&W and .357 Sig versions will hold 12 cartridges. I am not sure why the discrepancy as the magazines should easily hold 15, but that’s what the web site says,which was confirmed by a company representative. The gun will fire without the magazine in place, which is important in a self-defense handgun.