Took my carbine in 40S&W out for the first time today. It had an aftermarket rear peep on it. Took a little bit to dial that in. Once I did, it was doing about 3" groups at 60 yards. I took the peep off and adjusted the rear open sight for the same distance. I could do about 2", five shot groups with that sight from the bench. I was shooting 180gr, LRN, 5 grains of HP38. Chronographed at 1140fps average. Standing, offhand, I could bust clays with boring regularity. That is adequate for me. I tried some aluminum Blazer ammo and stopped when the first round was ripped in half at ejection. Anyone else have this occur? All in all, I am extremely satisfied with this little carbine. It felt very much like an M1 carbine to me.