Thanks to H&K and Trijicon, I have a chance to do some shooting with an MP7A1 PWD today. The MP7 is unusual for a gun of its size and configuration in having a fully locked operating system; essentially a G36 scaled down to 4.6x30mm. This allows the gun to be lighter, as the action is not dependent on bolt mass to delay the breech from opening.

I was expecting the MP7 to be extremely soft shooting, and was rather surprised to find it with more pronounced recoil than I expected.