Adamc55

I think getting some more turns on the tube might do the trick. I'll try everything recommended and report back. Thanks for the help everyone 👍🏻

Order cancelled

Crap, totally missed that. I'll have to cancel the order. That's what I get for jumping the gun

If I remember correctly I tried to do another turn but it was hitting the high point of the stop. I'll try and make a notch for it like you said. I also ordered an Armalite h3 buffer, same weight but a little longer.

I will try the quarter trick for sure. Here is a pic of the gas tube in the upper

This all explains why the recoil felt really hard and sharp

Ok, so I had a few free minutes and tore the rifle down a little. I discovered some troubling things. First off the shadow line from the gas block port covers the barrel port plenty, so positioning there is good. But I did notice marks on the lower in front of the buffer tube like jtallen83 mentioned. I removed the buffer and spring and slid the bolt into the tube. It makes contact in the worn off spots. It's weird because it locks back by hand but it's very obvious that it is mechanical contact that is keeping the bolt from going all the way back. The buffer is 2.5" long end to rubber end. The spring is only 11" long which seems short. But regardless the bolt could never go further back into the tube.

Hey guys, first post here but this looks like a very informative community so thought I'd ask here first. I recently finished an lr308 build and I'm having trouble getting it to cycle properly. First few shots I was stupid and had 3 rounds in the mag. I ended up with a bunch of pinched brass from the bolt ramming into them while returning to battery. I had no tools with me to adjust the gas block so I cut my losses and stopped shooting it for the day. 2nd time out I had tools with me, so I was able to make some adjustments to the gas block. I didnt go crazy with it but same deal, pinched a few rounds (made the same dumb mistake as the first time) and then would just eject brass without stripping the next round. At this point I thought maybe the bolt is moving too fast since I always hear 308's are over gassed. 3rd time out, yesterday. I finally wised up and was only loading one round in the mag to see if the bolt would lock on last round. Negative. I tried gas block full open, full closed and everywhere in between. It would go from barely lobbing out the spent brass onto the shooting bench about 1' away to just re inserting the brass into the barrel. Now I am convinced the bolt is not moving far enough during fire. So far my thoughts are maybe the buffer and spring combo is wrong, which would be strange because it seems a lot of people run them. The charging handle is really heavy to pull though. Or maybe the gas ports are not lined up, which I intend to check today but when I installed it I was able to blow through the barrel with the other end plugged and felt a good amount of flow. I also just recently saw that sometimes a small space is needed between the gas block and shoulder on the barrel and I know mine is right up against it. I guess I just wanted to make sure I didn't miss something or if anyone had any other recommendations on what to check. The bcg was well lubricated but the buffer /spring were not. Here's a list of build parts that matter- Aero m5 upper/lower Aero lower build kit Faxon .308 bcg Faxon 18" heavy fluted match barrel Fortis r.e.d. muzzle brake Seekins ar15 .750 adjustable gas block Rifle length ar15 gas tube Milspec carbine buffer tube Sprinco orange carbine length buffer spring Expo arms 5.3oz .308 carbine buffer