You can shoot an AR-15 pattern rifle, including the military versions, with the stock up against your nuts and it won’t hurt. The recoil is very low because the power is very low and the system of operation absorbs a lot of the energy, combined with the weight of the rifle means it is soft shooting. The stock doesn’t need to touch your shoulder for you to be accurate with effect out to 50 yards or more so long as you do your part.
Honestly, just having it pulled against any part of your body with a decent view of the sight is enough to ring steel or put holes in paper.