All USP pistols can be converted; however, older than 1995 needs many upgrades from trigger to hammer strut and slight modification of the frame (mods recommended to be done by HK only). 1995(KF) to 2005(AF) LEM can drop in with addition of longer catch (#219442). Models 2005 to current have newer long catch already installed from factory.
A forum dedicated to and laser-focused on Heckler & Koch firearms, Heckler & Koch accessories and the owners and enthusiasts that love them! Come join the discussion regarding HK pistols, long arms, NFA arms, HK accessories, HK history and trivia and more.