Cole Partnerships and Training and ATEi have collaborated to produce the M&P Hybrid Kit. This kit comes with everything you need (extension block and new recoil spring assembly) to install your full size S&W M&P slide assembly on a S&W M&P compact frame. This configuration results in something closer to what many shooters want in a midsize M&P.
I have found, with Glock 17s chopped to take Glock 19 magazines, that this configuration is excellent for inside the waist band and especially appendix carry. It places more slide length below the belt line which serves to anchor the gun and help prevent the grip from pushing out away from the wearer. The shorter grip reduces bulk and printing above the belt line. Best of all, shootability is greatly improved over a compact.
The kit is available with either a black nitride or nickle boron finish and costs $125. You must call ATEi to order – (313) 388-8228.