I recently bought a used Kuehl .22 upper. From what I can gather, this is an earlier model (non-captive bolt assy). This is for use on my M16, and has the auto-trip and anti-bounce weight.
I've only had it out a couple times...first time it had a fair number of jams (doublefeeds, fail-to-ejects), but I did get one clean mag dump. I then polished the Ciener kit contact areas with a Dremel felt wheel and some Brasso, and also did the feed ramp- carefully, I thought.
I now have a nice gouge on the feed ramp, and the upper will not feed consistently at all. I've tried hand-sanding it with 220 grit wrapped around a 22 cartridge, still no joy. Pretty sick about this.
I haven't taken it to my 'smtih yet, but am assuming that I've cocked the thing up. In case he cannot fix my clownings, what options are available to me to get this thing back up? I understand Kuehl is no longer in biz, and that the Spike's barrels would work (with milling on the sides for the Ciener kit rails), but that Spike's no longer sells them.
Could one of the collars from CMMG be made to work (with rail milling)? If not, are there any other .22 AR barrels available that could be made to work?
Any suggestions greatly appreciated...I've got a good 'smith, but would like to have some ideas to offer him if I'm not just totally hosed here.