it was designed to work in HK G3 type rifles by changing the bolt out for a pure blowback. It fires dirty but is very accurate at 25m (was designed to be fired at 25m using 200m sight settings). It wont cycle the action of a semi-automatic rifle unless it is a G3 type with the specialized bolt. It wont hurt your rifle in anyway. I have used it for years in my PTR with the correct bolt. Great cost saver, nice low recoil. Fun to watch the blue casings fly 4 lanes over. Folks are always confused. Should work great in a bolt gun.
I bought a bunch to shoot out of my old 1891 Argentine 308 Mauser, (sold),, and my current Spanish 7.62x51 Mauser. I like it. Mainly got it for my kids to shoot it, but it is fun. Sometimes doesn't penetrate the plywood backing, and either gets stuck in the board or bounces off. Haven't shot it in a while though. https://www.mdshooters.com/showpost.php?p=2761088&postcount=6
in a correctly converted G3 it runs very well. very amusing to flip the switch and watch the rain of bright blue cases fly all over the place (G3 with sear). These also work very well for close range squirrel/other small rodent control. Screw a can on the ol' G3 and pop the tree rats. overpenetration of the wood is a nonissue.
To allow for training without worrying about shooting up the populace, the Germans developed several different types of short range ammo. They are usually good for 25 yards and won't hurt your gun. At one time, you could get 800 rounds of 7.62 NATO for $49.
that it would be. HK sear packs in host guns are fun to play with. G3s do tend to kick the snot out of you though. Converted to fire these, a G3 becomes kid/girlfriend friendly. With these and a can, it does about as well as a 9mm MP5 with can on a tree rat or rabbit at 25yds or less and is much safer to use when they are up the tree or you have potential ricochet issues. I wouldn't suggest using them on groundhogs or other larger pests as the likelihood of a humane kill is, to my way of thinking, low.