Epicersatz

I also wanted to add this description and picture and not sure if it is relevant. Upon closer inspection of the barrel and gas port it seems there is an insert or collar in the gas port hole.

Ok so after some more measurements: My caliper couldn't get in the gas port well so I turned to a drill bit and a 5/64 fit all the way in the hole but a 3/32 was just a tad big to get in. When I put the calipers above the hole I was estimating .089. Here is a pic of the buffer tube. I am starting to go with the fact the gas port might be a tad bit undersized.

To answer 1 through 3 - I am not very experienced at all with rifles so thank you and notated. I have a couple of AR15s but don't shoot my rifles very much. I will add that to your number 1 I normally don't rest of my hand there, it does have a bipod so my hand is normally not on the rifle (basically saying that the rifle still has the feed issue regardless) Number 4 I had taken the scope and handguard off to check the gas block at the range and used the scope mount to line up the rails on the handguard and upper till i could get back home. I do normally have the scope closer to the back of the rifle. @edgecrusher and @98Z5V Being still new the platform with AR/LRs can I just get a new extractor and springs and work with the bolt? At this point is it even a worry since I haven't had issues with extractions? I am going out to the store in a bit to get some tools so I will post some more pictures of more measurements when I get back!

The buffer is 5 and 1/4th inches long. Here is a picture of the bolt with double extractors springs. Sorry I thought i put extractor springs in that post. Its been one of those days.

I can go ahead and answer some of those questions. The overall length of the tube is 9 and 7/8th inch, if I include the small extension where you screw in the stock its 10 inches. The depth or internal length is 9 and 1/16th inch. The spring is just a standard aero 308 spring, i was incorrect in the length in my first post. Its 11.25 inches and I believe 32 or 33 coils.

Yep! I was in the process of cleaning it when i posted that picture but wanted to snap that pic based on the pinned threads in this topic of things to check first. But yeah normally use Mobil 1, shell aero grease, or marine grease when I go out. I am pretty positive based on the video the BCG is not coming back far enough and if I need to drill out the gas port I can but where I am I do not know any gunsmiths who can do that and I don't trust myself enough to do it.

I haven't measured the port myself but after speaking with the owner of X-Caliber he assured me that the gas port was drilled at .095. I got the lower completely assembled from Aero so whatever they put in it. Yep. ~295 rounds hand cycled. I was trying to put some rounds through thinking it would start to break in and jell together. But when I hand cycle it they load just fine and even lock on an empty mag. Firing the gun won't lock back on empty mag normally.

I also forgot to mention. The rifle has ~300 rounds through it. Each time I take it out I put either Mobile 1 aero grease or marine grease I have.

I wanted to add that the bcg has good clearance into the buffer and will go all the way in. When I manually cycle it works fine. I have also included a picture of the gas tube into the upper.

HI all, I completed my first AR10 build some months ago and have been trying to troubleshoot an issue I am having. I will list my specs then the issue. It is a DPMS Pattern chambered in .308. Aero m5 upper and lower Aero Rifle buffer system (Buffer is 5.6oz and spring is 11.75 inches long uncompressed) X-Caliber 18 inch barrel with rifle length gas system Forward Control Design gas block (low profile, non adjustable) Seekins BCG with double extractor Radian Charging Handle THe issue I am having some day one is it won't cycle properly. It will eject at 3 oclock just fine, I have never had a failure to eject. It won't load another round from the magazine (99.9%) of the time. I have had maybe 3 or 4 times where it loaded a round just fine then the next shot it wouldn't load. I have including a link to a video in slow mo. https://streamable.com/fmv5fb The best shot of the bolt is around the 2:25 mark. I am pretty sure the rifle is short stroking Here are the things I have tried. I have tried a different gas block and tube Different rounds with different loads Different mags Headspace checks out I have not yet tried: Different weight buffer or spring. I have searched for a ligher or shorter spring and I have been unsuccesfull in finding a lighter or shorter spring so any advice there would be great or other any possible fixes yall can think of?

Hello everybody, New to the forum here, a little about me. I live in North Carolina, work in banking, and have been a firearm enthusiast for many years. I have a slew of pistols, a couple of AR15s, and just built my first AR308. That is about it I guess.