MinnMD66

Updated lock back issue. Well guys, I ordered the 7 position Vltor A5 buffer tube, EA1095 armalite buffer spring, a 5.0oz H3 buffer and everything finally works great. It's just amazing how the simplest of all component can be such a pain in the ass. Thanks to all that commented.

I'm glad you caught that because I didn't even link those two together. The bolt appears to be flush with the back of the upper and it does seem to come in contract with the buffer face but I wouldn't say much. When I get home tonight, I'll get some detailed pics.

308kiwi This is the same rifle in the two posts. I

I'm not sure if there is any difference between the spring I have now and the one I just ordered but the new one says specifically LR308. I'll try that in this setup before I switch anything else. The vltor is the A5 and it's the 7 position tube. Thank you 98Z5V and others, you've been some good help. Appreciated

When I close the upper, i can feel the slight tension on the bolt and buffer and it only happened when I changed to the lighter buffer weights. I ordered a different spring and the vltor buffer tube so I can try the slightly longer buffer. That way I can add a little more buffer weight. I'll try anything right now.

A couple pics. The only time I had problems with the buffer face was when I dropped down to 2.2oz. It didn't happen when it was at 3.8oz. Pic 2 is the buffer and bolt bottomed out in the buffer tube. I did try my ar15 buffer and it was too long. The bolt wouldn't lock back on the catch manually.

I will try and load pics tomorrow. The rundown. Anderson 18" barrel, rifle length gas system, seekins adjustable gas block, cheap flash suppressor, aero precision upper with a kak bcg, 80% lower from 80% arms, 308 carbine length buffer and tube from aero precision. The tube depth on the inside is 7" to the retainer pin, buffer spring is 10 3/4" long, buffer is 2.5. When I manually charge the bolt, it sits roughly 3/8 inch past the bolt catch.

I guess maybe I should give a little more detail then. I'm running a carbine length buffer and tube. (3.8oz buffer and 308 carbine buffer spring). I ended up opened the adjustable gas block all the way and couldn't get lock back. My 1st experiment i reduced the buffer weight down to 2.5oz and that's when I noticed the slight dings in the buffer face and still no lock back. 2nd experiment i machined a buffer out of 303 stainless, weight of buffer 5.1oz, gas block open and still no lock back. I was maybe thinking heavier.

Brass is heavier than stainless so I was just curious if anyone has ever tried it.

Yeah that did cross my mind after I posted it. I started thinking the brass would maybe take a bit of a beating slamming against the retainer pin on return. Oh well, I guess I'll just go with the 303.

Without going into extreme detail. Has anyone ever heard of or had any experience with a buffer made of brass? I'm looking to add more weight to a buffer on an Lr308 that has a lock back issue and was just wondering if brass could be an option.

Oh and this is my first ever Ar build so get ready to pull your hair out Sketch buddy. I'm sure I probably won't make sense on some of this stuff.

The receiver is aero precision and the barrel is an Anderson. I picked it up used already assembled so I don't know all the details about everything. All I know is the guy said he didn't have any feed issues when i bought it, well low and behold I have feed issues. It seems to be limited to soft points for some reason. They jam to the top of the chamber if that's any help.

Hello everyone I was just hoping that someone on the forum could help me out with a feed issue that I've been having. As you can see from the pictures, there is a bit of a transition problem between the receiver and the barrel extension feed ramp. My plan is to mill out the material on the receiver area to match the feed ramps and just needed to know if this is a bad idea or not.