User Panel
User Panel
User Panel
|
Posted: 7/3/2017 8:24:59 PM EDT
[#1]
Are you shooting ammo and using magazines you've used without issue in the past?
|
|
|
|
Posted: 7/3/2017 8:56:02 PM EDT
[#2]
Quoted:
So I have a sbr upper that's always been gtg. But today it was single shooting. The fired round would eject but the second would jam halfway up the feed ramp. I brought it home and cleaned it and pipe cleaned the gas tube. Amy ideas on the cause? I'd recommend you email BCM. This is just very weird. My BCM 11.5" works like a boss. I've put several thousand rounds through it in hard training classes. |
|
|
|
Posted: 7/3/2017 9:19:29 PM EDT
[#3]
Today I was using black box American eagle and a magpul straight 20.
|
|
|
|
Posted: 7/3/2017 9:25:04 PM EDT
[#4]
Quote HistoryQuoted:
Today I was using black box American eagle and a magpul straight 20. Try a different mag - spring could be worn and not pushing a new round up fast enough. |
|
|
|
Posted: 7/3/2017 9:34:24 PM EDT
[#5]
Had 2 different mp straights
|
|
|
|
Posted: 7/3/2017 9:39:33 PM EDT
[#6]
Slam that mag home. Shouldn't ever have to clean the gas tube.
|
|
|
|
Posted: 7/3/2017 9:45:39 PM EDT
[#7]
Recoil spring might need replaced, the Geissele Super 42 is perfect for SBRs.
|
|
|
|
Posted: 7/3/2017 9:51:06 PM EDT
[#8]
Not sure if it's the cause of your problem, but Magpul straight 20 round mags are known to be problematic. It's why the current ones are curved. I've also read that if you contact Magpul they will exchange them for you. That said, I have a few that I've had no problems with.
|
|
|
|
Posted: 7/3/2017 9:59:15 PM EDT
[#9]
I had a issue with my BCM a while back. The gas key on the carrier group bleeds gas like crazy. It would sometimes work flawlessly but then randomly not pick up a round or not lock the bolt back, etc.
Comparing to other bolts and using oil, I noticed the BCM sprayed out a lot of oil near where the screws set in. I sent it back and BCM replaced it and it worked fine. |
|
|
|
Posted: 7/3/2017 11:07:55 PM EDT
[#10]
Quote HistoryQuoted:
I had a issue with my BCM a while back. The gas key on the carrier group bleeds gas like crazy. It would sometimes work flawlessly but then randomly not pick up a round or not lock the bolt back, etc. Comparing to other bolts and using oil, I noticed the BCM sprayed out a lot of oil near where the screws set in. I sent it back and BCM replaced it and it worked fine. |
|
|
|
Posted: 7/3/2017 11:44:27 PM EDT
[#11]
Topic Moved
|
|
|
|
Posted: 7/3/2017 11:49:48 PM EDT
[#12]
Per BCM, make sure you have the o-ring installed under the extractor for the 11.5 uppers.
I had a similar issue. |
|
|
|
Posted: 7/4/2017 12:00:19 AM EDT
[#13]
No way! Can't happen! GD will serve up a verbal beatdown if you doubt the CHOSEN brands! Must have been you or your cheap ass ammo!
|
|
|
|
Posted: 7/4/2017 12:01:11 AM EDT
[#14]
|
|
|
|
Posted: 7/4/2017 12:18:28 AM EDT
[#15]
Quote HistoryQuoted:
Per BCM, make sure you have the o-ring installed under the extractor for the 11.5 uppers. I had a similar issue. I would check everything over for gas leaks, gas key and gas block primarily. Make sure your bolt is retracting all the way when cycling by hand. Also check out the lower, make sure the hammer can move through its full range, there's nothing under the trigger. Pull out the buffer and spring, make sure everything looks good. Might be worth trying another magazine if you don't find anything else going on. Whatever you do, don't pitch those magazines, or send them back to Magpul... there are many who desire them, so just sell them on the EE. |
|
|
|
Posted: 7/4/2017 6:30:28 AM EDT
[#16]
The two mags worked fine in my home built sbr that day. I think its gotta be a gas issue
|
|
|
|
Posted: 7/4/2017 8:04:12 AM EDT
[#17]
Quote HistoryQuoted:
The O ring has nothing to do with failing to chamber/feed. I would check everything over for gas leaks, gas key and gas block primarily. Make sure your bolt is retracting all the way when cycling by hand. Also check out the lower, make sure the hammer can move through its full range, there's nothing under the trigger. Pull out the buffer and spring, make sure everything looks good. Might be worth trying another magazine if you don't find anything else going on. Whatever you do, don't pitch those magazines, or send them back to Magpul... there are many who desire them, so just sell them on the EE. |
|
|
|
Posted: 7/4/2017 8:17:37 AM EDT
[#18]
Single feed it and check to see that it locks all the way back after ejection, also where is your brass Landing?
|
|
|
|
Posted: 7/4/2017 10:15:21 AM EDT
[#19]
I guess next time im out if its doing again Ill swap the bcg. That should tell me if its the stalk maybe. I could also try the upper on a different lower, that would tell me if its the recoil spring. If none of that matters then i guess it could be something with the tube/block.
|
|
|
|
Posted: 7/8/2017 6:17:19 PM EDT
[#20]
Try loading a few rounds (under 5) and see if you have the same problems.
|
|
|
|
Posted: 7/9/2017 4:05:34 PM EDT
[#21]
I don't know that seems odd. Try some 193 and a good GI magazine and lots of lube.
|
|
|
|
Posted: 7/12/2017 2:45:54 PM EDT
[#22]
Loose gas block. Had a similar issue when I first build mine using an complete upper purchased from CDNN. When I removed the hand guard, the gas block was out of position because the Allen screws were never tightened properly. Cleaned it, re-positioned the gas block and tightened the setscrews and it has been functioning perfectly ever since.
|
|
|
|
Posted: 7/12/2017 6:58:40 PM EDT
[#23]
Well this is a factory built bcm thats never choked on any ammo ive ever used (lots of tula included). I was using magpul straight 20s (my perfered mag that Ive never had a issue) and only loaded 2 or 3 rounds in the mag at a time (cause I was planing to work on reloading drills) it would choke after firing the first round everytime.
|
|
|
|
Posted: 8/17/2017 3:23:51 PM EDT
[#24]
So I finally was able to get it out again and the upper ran fine with a different bcg. That bcg that was a problem ran fine in a surpressed sbr upper (over Gasing i guess why) so would you all think its a leaking gas key problem?
|
|
|
|
Posted: 8/17/2017 7:08:51 PM EDT
[#25]
Look at the carrier key (gas key) area, where it mates with the bolt carrier. Look to see if there are any signs of any carbon jetting out from underneath, usually seen going downward/rearward at a 45-degree angle. If you see the carbon jetting, then I would suspect a broken carrier key screw. I've seen this on a few BCM carriers & rifles, where they worked for a while, then all of a sudden went single shot, and in each case there were broken carrier key screws. If you suspect the carrier key screw is broken, then either contact BCM as they have great customer service, or you could also replace the key and both screws yourself.
CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 |
|
|
|
Posted: 8/17/2017 9:55:38 PM EDT
[#26]
Check the gas rings too. What's their life, like 3000 rounds?
|
|
|
|
Posted: 8/17/2017 11:06:14 PM EDT
[#27]
Well i am probably at the 2k-3k rounds. But bcm said send it in.
|
|
|
|
Posted: 9/8/2017 6:37:55 PM EDT
[#28]
Heard back from BCM, they said it was on the lowest passable headspace and a broken fastener (which I didn't see on inspection) so they changed out the broken and worn out parts and on the way back. Gotta love bcm!
|
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
