If you just want to make noise they're great. I bought a 223 to 22wmr off e bay for under twenty bucks hoping to get another caliber going for just a few bucks. First trip to the range was all it took to realize I wasn't going to be happy with it. I was getting random hits all over an 8 inch target at about 50 feet. Maybe some are better than others, but honestly I should have put my money toward ammo or another barrel.