They shoot
It is very common for these rifles to have issues fitting into their stock properly. If they're the least bit loose, the receiver moves within the stock, under recoil, ruining accuracy. If they're too tight, accuracy will suffer as well, and the rifle's action may have problems functioning. The importance of proper bedding can't be underestimated.
While they're not tack drivers, Minis can shoot. And they do shoot.
6" at 50 yards, or worse as some folks stated, is indicative of a problem. Assuming all the parts are there, and properly attached, I'd carefully inspect the crown for damage, bed the stock and re-fit the gas-block. Nearly free and your Minis will shoot better.