Included in the purchase of my subgun was a Practical Solutions .22lr conversion kit. I ran across it whilst cleaning and reorganizing stuff. I decided to install and try it out. I set it up with my HA .22lr suppressor and some Gemtech subsonic ammo I recently purchased. I was not able to go to the range so I let loose a few rounds under the cover of a passing train out the back door. I loaded up 5 rounds and let loose. There were no issues. At least I know it works. Even suppressed it was still rather loud due to the nature of the weapon. It was not the bullets exiting the muzzle but rather the short lock time of the bolt. I now plan on trying it at the range next opportunity. The only complaint I have is that it came with 40 rd mag but not able to use due to follower sticking. You cannot buy them right now but fortunately I had purchased two 20 rd mags a while back. The rate of fire was not super fast which I liked and was partially contributed to the 42 gr subsonic ammo. I am sure if I ran CCI stingers or a hotter round it would be a little faster. It takrs about 5 mins to change over from the Max-31 9mm upper so this is an advantage at the range.