ynososiduts

Yup, have a tube of superlube coming in with my boresnake. I just gave it a small drop of CLP on each side and spread it with my finger before I went to the range.

There's some marks on the inside top of the upper that have similar jittery marks to the wear on the bolt. They look darker than the metal surrounding it, like the finish from the bcg is rubbing off on the upper.

I just bought an AR-Stoner 6 position milspec carbine buffer tube kit off midway. I've been handling the bolt and pulling back on the charging handle like crazy. I think its just a cheap finish. I also don't think it was lubed enough for the first 70 rounds I put through it.

Yup! Thank you, and everyone else. I'll update y'all if it turns out that wasn't the problem.

You would think if it fired one round it would fire all rounds.

The pattern is the same on both sides and on the top by the gas key. It looks the same as the wear on the rails on the slides of my pistols after a few hundred rounds too. Could running it too dry be the cause? Or just the cheap PSA finish?

I kind of feel like an ass, but the spring was indeed backwards. That explains the FTFs.

Pictures! http://imgur.com/a/QwX1P That brass fouling on the bolt face doesn't look nearly as bad in person as it does in the picture.

I'll try to take pictures when I get home. The carrier moves all the way up without the bolt. Ammo was a mix of federal and Tul, both go into the chamber and fall out without any sort of force. By all the way I mean as far as the cam pin allows. It did feel a little tight when I took it apart last night. I had to pull on the fire pin to get it out too which seemed odd.

I would but I'm awful at taking pictures and it looks pretty much exactly like any AR15 BCG I see. Maybe...? I'm new to the AR15 game. The locking lugs seem to line up when I hand cycle the BCG in the upper when it's not on the lower. I can push the carrier in all the way without the bolt so the gas key is seemingly lined up. When it's firing it just seems like the bolt isn't turning and pressing into the bolt all the way.

I did notice the stock was a touch loose at the range.

The whole BCG moves freely in the upper/buffer tube, and the bolt face looks like any picture I've seen in the internet.

I took my newly built AR to the range for the first time and have a weird problem. I'll get a light primer strike, pull back the charging handle and manually cycle a few rounds that'll all be lightly struck. After manually cycling 4 or 5 rounds that FTF I'll eventually get a round that'll fail to eject. When I go to separate the upper from the lower I noticed the bcg was pushed back into the buffer tube a bit past where the upper receiver ends, necessitating pushing out both takedown pins. After getting it apart I can manually push the carrier forward, put it back together and it'll fire a few more rounds before not firing the next. Any ideas? The bolt seems to be getting stuck in the extended position causing the firing pin to not push into the primer far enough.

When I went the guy had a check list. I was 3 hours early and he didn't seen to think anything of it.

It's all the same story. I could get it a week earlier if I take off of work, but it doesn't seem worth the hassle to take off just to do it 5 days sooner. The one closest to me is just completely booked. There are no available appointments at all.