Did anyone have any issues with installing the kit? I tried two different slides, one a KWA and one a KSC and they were both really tight and wouldn't slide freely. I actually managed to sand down the slide rails on the upper to make it fit and slide back and forth freely, but it doesn't shoot properly. It will shoot about half of the BBs out, then stop feeding. Will still blowback, but not strong enough to chamber the next round.
Did I get a defective kit? Does anyone know how Redwolf handles returns? Do you have to pay for postage?