Reply
Go Back   TexasBowhunter.com Community Discussion Forums > Topics > The Other Side of the Ranch (Firearms)
 
Thread Tools Display Modes
Old 11-14-2017, 04:59 PM   #1
young dunner
Eight Point
 
young dunner's Avatar
 
Join Date: Oct 2012
Location: Seabrook
Hunt In: Wherever invited
Default AR-10 Question/Help

I built (assembled) a .308 for a buddy of mine. The rifle set in his safe for 8-10 months before deciding to take it to the range. I went with him so we could run it and site in the optics that he bought for it. So, first issue is that it continually would not eject the spent case and the following round would jam in the middle of the ejection port. This happened numerous times and we decided to call it a day. I was thinking that since it had set so long unfired that it probably just needed a deep cleaning and lube.

I broke the rifle completely down. Tore down the BCG and cleaned it with a soft wire wheel on a Dremel tool. oiled everything up extremely well then checked the gas system. The gas system is correct for the rifle and aligned properly. Head back to the range a few days later and it now charges better and ejects the spent case flawlessly but does not chamber the next round. Its as if the gun is cycling too quickly.

Has anyone dealt with an issue like this? I'm thinking that maybe the springs in the Magpul mags are not stiff enough to push the next round up in time, maybe the buffer is not correctly weighted? Any ideas?

Last edited by young dunner; 11-14-2017 at 05:05 PM..
young dunner is offline   Reply With Quote Back To The Top
Old 11-14-2017, 05:04 PM   #2
AgBass01
Pope & Young
 
AgBass01's Avatar
 
Join Date: Jul 2014
Location: Round Rock, TX
Hunt In: Cuero, Brownwood
Default

Sounds like a mag issue to me as well.
AgBass01 is offline   Reply With Quote Back To The Top
Old 11-14-2017, 05:07 PM   #3
sir shovelhands
Ten Point
 
Join Date: Mar 2014
Location: Houston
Hunt In: Texas
Default

It sounds like it's short-stroking.

Have you single loaded it? If so, does it lock back when the mag is empty?

What mags are you using, what buffer, what buffer spring, gas length, barrel length, ammunition specs?
sir shovelhands is offline   Reply With Quote Back To The Top
Old 11-14-2017, 05:07 PM   #4
SC-Texas
Ten Point
 
Join Date: Nov 2011
Default

What magazine are you using?

Sent from my SM-N920V using Tapatalk
SC-Texas is offline   Reply With Quote Back To The Top
Old 11-14-2017, 05:08 PM   #5
SC-Texas
Ten Point
 
Join Date: Nov 2011
Default

1. If you chamber one round on a empty magazine does the bolt lock back?

2. When you say it does not chamber the next round after ejecting, what is the failure? Is the bolt closing on an empty chamber?

Sent from my SM-N920V using Tapatalk
SC-Texas is offline   Reply With Quote Back To The Top
Old 11-14-2017, 05:10 PM   #6
StickSlinger
Four Point
 
StickSlinger's Avatar
 
Join Date: Oct 2012
Location: Killeen Tx
Default

check the buffer spring you might need to shorten it a little I had the same issue after I put a collapsible stock on mine after I shortened the spring it works just fine
StickSlinger is offline   Reply With Quote Back To The Top
Old 11-14-2017, 05:24 PM   #7
young dunner
Eight Point
 
young dunner's Avatar
 
Join Date: Oct 2012
Location: Seabrook
Hunt In: Wherever invited
Default

Quote:
Originally Posted by sir shovelhands View Post
It sounds like it's short-stroking.

Have you single loaded it? If so, does it lock back when the mag is empty?

What mags are you using, what buffer, what buffer spring, gas length, barrel length, ammunition specs?
I have not tried this but will this weekend. Great advice, haven't thought of that. I will reply later with all of that other info but the mags are 10 round Magpuls.

Quote:
Originally Posted by SC-Texas View Post
What magazine are you using?

Sent from my SM-N920V using Tapatalk
10 round Magpul

Quote:
Originally Posted by SC-Texas View Post
1. If you chamber one round on a empty magazine does the bolt lock back?

2. When you say it does not chamber the next round after ejecting, what is the failure? Is the bolt closing on an empty chamber?

Sent from my SM-N920V using Tapatalk
I have not tried single loading but will this weekend. Yes, the failure is the bolt closing on an empty chamber.

Quote:
Originally Posted by StickSlinger View Post
check the buffer spring you might need to shorten it a little I had the same issue after I put a collapsible stock on mine after I shortened the spring it works just fine
I will give this a try after giving the other suggestions a shot.

Thanks everyone for the suggestions and advice
young dunner is offline   Reply With Quote Back To The Top
Old 11-14-2017, 05:36 PM   #8
SC-Texas
Ten Point
 
Join Date: Nov 2011
Default

Measure the receiver extension. How Long is it?

Do you know which receiver extension aka. Buffer tube you used? Make and model?

How long is the spring. What spring is it?

How long is the buffer?

How much does the buffer weigh?


What is the Make and model of the buffer and sping?

Sent from my SM-N920V using Tapatalk
SC-Texas is offline   Reply With Quote Back To The Top
Old 11-14-2017, 09:08 PM   #9
young dunner
Eight Point
 
young dunner's Avatar
 
Join Date: Oct 2012
Location: Seabrook
Hunt In: Wherever invited
Default

Measure the receiver extension. How Long is it?
7"

Do you know which receiver extension aka. Buffer tube you used? Make and model? Unsure.
Think it's just a generic from PSA, can't remember.

How long is the spring. What spring is it?
I believe the spring and buffer are from PSA. It's 11"

How long is the buffer?
2.5"

How much does the buffer weigh?
3.88oz, 110 grams

What is the Make and model of the buffer and spring?
PSA I believe
young dunner is offline   Reply With Quote Back To The Top
Old 11-15-2017, 03:13 PM   #10
young dunner
Eight Point
 
young dunner's Avatar
 
Join Date: Oct 2012
Location: Seabrook
Hunt In: Wherever invited
Default

Just got back from the range. With a single round chanbered and an empty magazine the rifle would fire and eject but return to the charged position. Also, on several shots it would not fully eject the spent case. I can manually cycle a full magazine with no issues. I'm now leaning toward the gas system or ammo.
young dunner is offline   Reply With Quote Back To The Top
Old 11-15-2017, 03:26 PM   #11
SC-Texas
Ten Point
 
Join Date: Nov 2011
Default

Quote:
Originally Posted by young dunner View Post
Just got back from the range. With a single round chanbered and an empty magazine the rifle would fire and eject but return to the charged position.
It is under gassed.

What gas block are you using?



Sent from my SM-N920V using Tapatalk
SC-Texas is offline   Reply With Quote Back To The Top
Old 11-15-2017, 03:34 PM   #12
SC-Texas
Ten Point
 
Join Date: Nov 2011
Default

Also check to make sure the gas key is tight on the bolt carrier

Sent from my SM-N920V using Tapatalk
SC-Texas is offline   Reply With Quote Back To The Top
Old 11-15-2017, 03:35 PM   #13
SC-Texas
Ten Point
 
Join Date: Nov 2011
Default

Also check the gas rings on the back of the bolt

Sent from my SM-N920V using Tapatalk
SC-Texas is offline   Reply With Quote Back To The Top
Old 11-15-2017, 04:09 PM   #14
young dunner
Eight Point
 
young dunner's Avatar
 
Join Date: Oct 2012
Location: Seabrook
Hunt In: Wherever invited
Default

Quote:
Originally Posted by SC-Texas View Post
It is under gassed.

What gas block are you using?



Sent from my SM-N920V using Tapatalk
It's just a generic .750 low profile billet gas block with 3 set screw under it
young dunner is offline   Reply With Quote Back To The Top
Old 11-15-2017, 04:52 PM   #15
spro
Four Point
 
Join Date: Oct 2014
Location: Highland Village, TX
Default

Not sure if your issues are similar to mine. My AR-10 would jam constantly even after trying multiple mags. Changed from soft point to polymer tips and problem solved.
spro is offline   Reply With Quote Back To The Top
Old 11-15-2017, 05:55 PM   #16
SC-Texas
Ten Point
 
Join Date: Nov 2011
Default

Quote:
Originally Posted by spro View Post
Not sure if your issues are similar to mine. My AR-10 would jam constantly even after trying multiple mags. Changed from soft point to polymer tips and problem solved.
He has a gas issue. Too little gas. I.e. the bolt doesn't lock back on the last round

Sent from my SM-N920V using Tapatalk
SC-Texas is offline   Reply With Quote Back To The Top
Old 11-15-2017, 09:11 PM   #17
young dunner
Eight Point
 
young dunner's Avatar
 
Join Date: Oct 2012
Location: Seabrook
Hunt In: Wherever invited
Default

I may have figured it out. I'll know for sure after this weekend. I pulled the gas system apart, again. Checked the alignment of the gas port on the barrel in relation to the port on the gas block, its was correct. While checking out the port on the gas block I noticed an intrusion. The hole in the gas tube, fully inserted, did not line up with the hole in the block. There was an overlap. I ran a drill bit thru it and opened it up so there's no intrusion. Hopefully that's all there was.
young dunner is offline   Reply With Quote Back To The Top
Old 11-15-2017, 09:31 PM   #18
SC-Texas
Ten Point
 
Join Date: Nov 2011
Default

I was going to ask if the gas tube was upside down

Sent from my SM-N920V using Tapatalk
SC-Texas is offline   Reply With Quote Back To The Top
Old Yesterday, 11:05 PM   #19
SC-Texas
Ten Point
 
Join Date: Nov 2011
Default

Updates?

Sent from my SM-N920V using Tapatalk
SC-Texas is offline   Reply With Quote Back To The Top
Old Today, 12:01 PM   #20
512robby
Four Point
 
Join Date: Sep 2016
Default

I went through the exact same experience

I built my LR308 from a stripped lower

And I had the same ejection issues

Buy a Superlative adjustable gas block

Buy correct diameter

Call Clint at


http://heavybuffers.com/

Clint will set you straight on your spring and buffer

Install the the new gas block and align by marking with pencil

A straight line on the barrel gas hole

To a straight line marking the hole on the gas block

Next

Use the extra long Allen wrench provided with the gas block

Fire one round at a time until you get the spent brass ejecting at 3 O Clock or 4 O Clock

Make small adjustments on the block until itís right

It should be good to go with the combination of adjustable gas and heavy buffers spring and buffer


Sent from my iPhone using Tapatalk
512robby is online now   Reply With Quote Back To The Top
Old Today, 12:02 PM   #21
512robby
Four Point
 
Join Date: Sep 2016
Default

https://www.midwayusa.com/product/10...k-ar-15-lr-308


Sent from my iPhone using Tapatalk
512robby is online now   Reply With Quote Back To The Top
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 04:49 PM.


Powered by vBulletin® Version 3.8.1
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Copyright 1999-2012, TexasBowhunter.com