Pistol
At times I carry a FN .45 Tactical with Trijicon red dot in a custom Kydex belt holster I had made. It conceals fairly well with the Kabar vest I normally wear. It will print a smidgen though. Size is not the problem, the weight is. A large .45 with 16 rounds is a wee bit heavy even in plastic. The pistol itself is, in my opinion, "the best available". There is nothing a pistol can do - that the FN won't do. Actually it's "more" than a pistol with the Trijicon. If you wish to shoot a squirrel in the head at 20 yards or a Terroist in the eye at 50 the FN Trijicon combo will do do it. If you can. All that being said, I normally carry a Glock 23 stoked with Glock 22 mags and a collar to fill the "gap".