Enjoy the kit. I used to use one with my HK91 (with sear). Fortunately, never had an issue with it. The weight of the platform absorbed anything the .22 could throw at it. I don't recall whether I suppressed it, but I remember it being pretty quiet as well. I mainly stopped using it as I had such a hard time getting the barrel insert out. I'm not sure if this is a problem for all (my insert could have been a little bulged, etc., and not known it). Nowadays, I tend to use either a shorty .22 upper on my M16 or the AM180 (which I bought after shooting yours
...).
I thought about cutting it down for my 51, but part of the fun of the 51 was just taking off the flash hider and dumping a mag for the fireball (and sound - always seemed to stop everyone else on the range for a moment).