I bought a can cannon upper. It's really fun launching the cans. But............ big problem. Every time I fire a blank, my bolt gets stuck. Like stuck hard. I can pull back on the charging hanlde some fraction of an inch, but that's it. It will not budge further than that with my own strength. After each shot I made, I had to take my upper off and bang on the charging handle with a hammer (chewed the CH up pretty good.) After a few whacks the BCG would come flying out.
After that I could place the BCG back in and chamber a blank and continue to cycle the bolt as much as I pleased with relative ease. But.... as soon as I fire a round, the bolt get's stuck again. I've taken the can cannon out shooting twice. The first time I figured it was a lube problem. The second time I went out with a moderate amount of lube, and then put copious amounts of lube in there. Still had trouble.
I don't think it's a problem with my BCG because it's the BCG from my go-to AR15. And, in fact, after I was done with the can cannon I put the BCG back in my AR15 and it ran with no problems.
Anybody know what this could be?