I have a M637 for a while, have tried a few types, you might try a Blackhawk IWB cloth, small auto pistol holster, try it at 1 and 11 O'clock. the J frame holster sets a little to high, the auto sets around 1 inch lower under my belt, a lot more secure, if you move around a lot, or bend over, the ones just above the belt, seems like your gun will fall out easy, that's just me, everyone is different..
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