AR Sponsor
Posted: 9/15/2007 4:58:52 PM EDT
|
rifle: 11.5" franken AR, H buffer ammo 50gr federal HP= 2 failures, shot round and next round didnt even attempt to feed, bolt closed on empty chamber, no jam ammo 55gr rem. umc fmj= 20+ failures, double feed jam sound like short stroking to you, do i need a heavier buffer? |
USGI 30s and PMAGS, extractor works great, i have an H buffer, can i take apart a CAR buffer and put weights into the H to make it work? |
USGI 30s and PMAGS, extractor works great, i have an H buffer, can i take apart a CAR buffer and put weights into the H to make it work? Not sure about that but it's a good idea to have several buffers on hand when learning the quirks of your SBR. They're not that expensive so I would suggest buying H-H3 & trying them all until you find one that works best with your particular set up. From what I've read in the forums here, H2's seem to be a happy median for most SBR's. Is this the same AR you posted a range report on the other day? I thought it was running well for you? |
yeah it worked great the first 110 rds (all AE 55gr) then it had some 'unable to chamber' crap going on then when i started feeding it rem umc 55gr it messed up big, so obviously it dont like rem ammo but i still need to address the feeding problem. i guess ill be buying some buffers tonight |
It's the other way around. The heavier buffer delays the unlocking of the bolt so pressure drops and the case isn't pressed against the chamber walls as it is extracted. A lighter buffer would be more likely to help with short stroking, but I'd still make sure that's what was happening and touch up the gas port. |
|
Sounds like a gas issue to me. Do you have a standard front sight post? Have you ever removed it? Check the gas tube and make sure it has not been damaged on the end that goes into the front sight. I had a similar issue where I had made no changes with my rifle in over a year and all of a sudden it started doing what yours is doing. I tried to locate the issue but everything looked good. I started replacing parts with new stuff and damn near rebuilt the gun. The one thing I kept over looking was the GG&G flip up front sight (one of the first ones they produced) back then you had to send them your barrel and they put it on. The hole on the back side of the front sight had become less round and more oblong. I guess there was some slack in the barrel or the front sight and after thousands of rounds it had damaged the front sight post. There was enough gas escaping to cause the same issues you are having. Let us know if any of this helps. |
If you have the opportunity then run that Rem through another AR & see if you have the same probs. AE is good stuff unless you got a bad lot. It may be your weapon or it could be the ammo, but from your explanation I'm not sure it's short stroking. ETA: And unless you've had the barrel shortened or altered from it's factory length I wouldn't mess with the gas port until you've exhausted all means trying to determine what the prob is, even if that means letting an experienced smith give it a physical. |
|
unless you have a full auto gun you don't need the Heavy buffer the main purpose for a heavy buffer is to slow down the rate of fire and controlling bolt bounce you have a gun that is short stroking you need more bolt carrier velocity try a standard buffer, put one round in mag after firing check to see if the bolt is locked back if not you're rifle is still short stroking A larger gas port will give you more bolt carrier velocity open the gas port in small increments .002 to .003 at a time |
thanks for everyones support during these trying times
AR Sponsor