The distance between the bolt catch and trigger well are different between the 15-22 and a standard AR. When you put the lever I made on a AR the lever is too close to the trigger and sticks out the opposite side a bunch. The 15-22 lower is much wider than a standard AR.

I am working on a lever with adjustable arm to work for both platforms as well...comming soon.

As far as how many rounds the testers put through so far, before I sent them out I put 4 boxes of federal bulk 550 thru each lever.

I will try my hardest to always put out something that I feel is a quality product. I will test the fit and function of everything before it goes out the door.