Midway USA sells the frame plugs for these pistols periodically. I ordered one last week, and it was basically a piece-of-styrene plastic junk, that does-not, I repeat does-not fit a S&W 40 VE. You wind-up with piece of plastic that hangs-down beyond the inserted magazine, at least 3/8 of an inch. I almost wrecked my gun, trying to get it back-out! Take warning, do not buy one of these frame plugs.

Smith & Wesson Frame Plug S&W SW40C SW40E SW40F SW40G SW40GP SW40P