AR 10 DPMS feeding issues
- Thread starter Gregg C
- Start date
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Ammo is
Just found that thread. I'm nosing up before I cut it up. I'll post here if it works. Thanks, folks for your time.
The upper if no changes have been made would have a full mass bcg. Soft point bullets can cause feeding issues depending on the weight. Being a 308 instead of (260rem, 6.5creed or other 308based cartridges) mostly doesn't have any feeding issues. Mags for 308 can have a bad manufacturing hiccup. I have used 6 different mags of different makes, capacity and value that have had 0 issues (except 1 pmag with bad spring). Do this test. Load 1 in mag only and try if it holds bcg open. 2nd try loading 3-5 in mag and check function (firing 1 round only)(2 maybe). If the bcg is held open upon empty mag then gb is working fine. Do you have a carbine or rifle buffer? Carbine buffer standard weight in the 3.8oz neighborhood. This weight will function fine with milspec ammo, but may not with imported ammo? Check and see what position the cases are ejecting at (2-4 o'clock is average). Below 4 is not enough gas. Above 2 is too much which can be fixed with a heavier buffer/spring combo.
Lighter spring/heavier buffer? The brass lands mostly between 2 and 4 o'clock. Occasionally I
One at 100, or 430-500. Those are rare, I've attributed to trash ammo. I'm tipping the nose up in the mag and try it out Sat or Sun. I can't wait to get this thing running reliably.
Oh yeah, is the gas tube at the block a tight seal? I noticed some soot around it. It's got around 200 eds thru it.
cohunt
Well-Known Member
Ok-- here we go-- 1st thing to check is the bullet feed angle....lots of pics comming
Black metal mag is an asc WITH tweaked lips-- the fde metal mag is an asc stock ( no tweak)
Notice how the bullet tips are pointed up with the tweak-- I think what is happening is your carrier is pushing your cartridge forward--- the bullet tips or case mouth are hitting the front of the mag or feed ramp and then the bolt is skipping over the round damaging the brass.
Hybrid fde mag is a Lancer with tweaked lips-- black poly mag is a magpul, no way to tweak those lips.
More things--- see the micrometer on the lower with mag-- the measurement is how high the follower sits in comparison to the top of the lower--- see how different magazines can be between different manufacturers!?
Another thing is in reference to your personal rifle/upper combo-- most mags load from the left side first-- but the asc maps load from the right side of the stagger-- sometimes this can help in feeding the very first or last round if you are having problems.
Here are side pis of the mags
Black metal mag is an asc WITH tweaked lips-- the fde metal mag is an asc stock ( no tweak)
Notice how the bullet tips are pointed up with the tweak-- I think what is happening is your carrier is pushing your cartridge forward--- the bullet tips or case mouth are hitting the front of the mag or feed ramp and then the bolt is skipping over the round damaging the brass.
Hybrid fde mag is a Lancer with tweaked lips-- black poly mag is a magpul, no way to tweak those lips.
More things--- see the micrometer on the lower with mag-- the measurement is how high the follower sits in comparison to the top of the lower--- see how different magazines can be between different manufacturers!?
Another thing is in reference to your personal rifle/upper combo-- most mags load from the left side first-- but the asc maps load from the right side of the stagger-- sometimes this can help in feeding the very first or last round if you are having problems.
Here are side pis of the mags
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cohunt
Well-Known Member
Here are front pics of the mags
cohunt
Well-Known Member
Here are measurements of follower height in my lower
cohunt
Well-Known Member
I also see that you might be having a double feed issue which could bee no enough gas/too much buffer and spring weight--- or too fast of bolt cycling/too light of spring or buffer..
BUT 1 thing at a time--- try the mag lip tweak first and let's see how that works before we get more technical.
You want to take some flat needle nose pliers and slowly tweak the lips up and out -- dont cut or tweak the back closed end though-- until the nose of the bullet is angling up and the bullet or case mouth won't hit the front of your mag...
Good luck, let us know how it goes.
BUT 1 thing at a time--- try the mag lip tweak first and let's see how that works before we get more technical.
You want to take some flat needle nose pliers and slowly tweak the lips up and out -- dont cut or tweak the back closed end though-- until the nose of the bullet is angling up and the bullet or case mouth won't hit the front of your mag...
Good luck, let us know how it goes.
Thanks, Cohunt. I tweaked them up ALOT, till the shoulder doesn't hit the little tit that holds the follower in. Gonna try that this weekend, hopefully it's all good. I'm thinking that pic I posted of the two shells trying to cohabitate the chamber were from the spent shell hitting the case catcher, and not getting out of the path of the bolt, but it's possible it's as you say, a deeper issue. Like I said, I'm pretty ignorant of these systems. I'll post back.....
