When Lone Wolf first launched the original Timberwolf frame, one of the first questions was "when will it be available in .45 ACP or 10mm?" That time is now, because they've revamped and upgraded the design to bring you the Timberwolf Large. The first thing you'll notice is that the TWL fits in your hand like a much smaller pistol - in fact we measured the grip circumference of the most popular factory 9mm service pistol, and the Timberwolf Large was only .007" larger. That's only the width of a couple of human hairs, giving you real .45 ACP or 10mm firepower in a 9mm sized package. The grip length accept G20/G21 Gen3 and Gen4 slides, as well as G40 sl Mfg: Lone Wolf Dist.