My host was a renowned mechanic, and he gave me some advice, not to mention having a vintage Postal Meter version so we could do side by sides whenever necessary. I talked to a couple old Marines, one an infantry Master Guns, another a pretty spry 90 year old Korea vet. They both told me the carbine likes it, as the Korean vet put it, "wet and sloppy". So, while we were sitting around drinking beer and enjoying the Idaho sky, did some light honing, bolt rails, feed ramp, etc. And juiced it up with Bore Butter. And kept shooting it, until that happy day when I machine gunned two 30 round mags through it without a fail. On the good side, its real accurate at 50 yards, we were blasting bottles hanging in a tree, fun on a stick. Have not had it out to 100 or more, but that's coming. Just added an adjustable rear sight from Kahr. All the ammo I put through it was Korean surplus, and the mags were either AO or Korean, so that has been a constant. Anyhow, just thought I would pass this all on. These things have gotten some bad press, well deserved in some cases. But if you have the time and some expert advice, you can work through them. Cleaning it is more of an oil change than a cleaning, but that's OK. I also think the Parkerizing process leaves some rough edges in the action that need to be worn off. Not quite ready to trust it with home defense or truck gun duty yet, but I think we'll get there if the current trend holds. Pics of the rear sight install for your enjoyment. Master Guns had the right tool for that.