I often carry a .45 acp revolver, a S&W M325 Night Guard -



It has a Scandium Alloy Frame with a Stainless Steel Cylinder; weighing in at 28 onces, unloaded.

With a good belt and holster, such as the holster made by Lobo Gun Leather (Lobo Gun Leather - Home) in the above photo, it is pretty easy to conceal.

Note though that I more often carry either a S&W M642 .38 spl J frame, or a Kahr Arms PM9 9mm.

All the S&W .45 acp revolvers are the big N frames to my knowledge.