[Cilantro]

I hate to pipe in here with an issue, but I figure it's on-topic and lots of glock experts will be on this thread, but basically: my new (from classifieds :P) KSC Glock 18c won't cycle back properly. It blows back fine, but 90% of the time won't cycle back properly, getting stuck somewhere in the middle, and venting out all the gas. At first I thought it had to do with the loading nozzle, since it seems like it's a pretty tight fit, and won't spring back smoothly, but now I'm thinking the slide itself may also be involved. Any suggestions? I cleaned it out, checked the parts, it all looks fine, but there's something going on here.

Thanks again, and mods please move if this isn't the right spot.