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Or if you're willing to use a 4 inch barrel revolver instead of your 6 incher, a kangaroo carry holster would be good: http://www.kangaroocarry.com/air-marshal-ii-holster

original dirty harry holster: http://www.lawmanleathergoods.com/

Given the proper holster, you may carry just about any gun. Your GP100 can be carried fine in a shoulder holster. Get one with the bottom supported by your pants belt to take weight off your neck/shoulder for a pain-free experience. It also helps if it is weight balanced for comfort. For example, if you carry a gun on one side, carry ammo or another gun on the other side (use a 2 sided shoulder holster). Use a shoulder holster with suspenders like straps that will help hold everything down to prevent printing. Wear the holster over a T-shirt and wear a dress shirt over the shoulder holster. Make sure to modify your dress shirts to close with either velcro or snap buttons. Or just buy western style shirts with snap buttons. To draw your gun, rip open your velcro or snap button shirt with one hand while drawing with the other hand. You can wear normal shirts, but be prepared for the "superman" maneuver when drawing by ripping your shirts to draw your gun. You may want to give "the original dirty harry holster" a try. I have never tried it, but I hear it's good. I personally use a home-made shoulder holster.

For your M&P, use a "smart carry" holster. I use it and it hides my Glock just fine. http://www.nrastore.com/nrastore/Produc ... SA%2022678