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Old 09-20-2019, 12:52 AM   #1
BBReezen
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Default 6.5 Grendel feed issues

So I just recently finished a Grendel build and have put a few rounds through it to test functionality. Have gotten my optics 100% mounted yet. Anyhow, I have put less than 10 rounds through it and I have had two “failed feeds”. Round halfway up the feed ramp with the bullet over the case end and wedging between bolt face and feed ramp. Can’t seem to find too much definitive answers on what it could be. Here is the rifle specs...

12.5” Ballistic Advantage Hanson barrel with factory gas block
Monster bolt type 2
e-Lander mags
SOTA upper/lower
Running a standard Carbine buffer kit (thought this might be place to start)
Hornady Black 123gr ELD off shelf ammo

Am I over gassed, under gassed, buffer weight issue, new gun issue, possible mag issue?

I have not tried the single round does he bolt catch scenario yet to check for short strokes.

Shot the gun 3 rounds one weekend and had the issue once and then shot about 5 rounds last weekend and had another do it.

Anyone have any idea where to start? I’ve been too busy to really try to dissect it so any starting point is helpful.

Last edited by BBReezen; 09-20-2019 at 12:55 AM.
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Old 09-20-2019, 12:54 AM   #2
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Gonna be a fun gun though I can already tell. Here it is
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Old 09-20-2019, 07:48 AM   #3
Walker
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Have you tried different ammo and do you have an adjustable gas block.
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Old 09-20-2019, 08:17 AM   #4
lbbf
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Mine did that. I changed to Elander mags and the problem went away. Maybe yours doesn't like the E-lander. I would try the single round first and work back from there. Try a standard 223/5.56 mag and only load 2 or 3 rounds and see if the problem goes away.
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Old 09-20-2019, 08:40 AM   #5
cjk349
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I've started having the same problem with mine. I haven't messed with it too much yet, but I'm thinking that the mags may be my issue. I'll let you know as I find out.
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Old 09-20-2019, 09:24 AM   #6
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Mags first then gas would be my second guess.
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Old 09-20-2019, 09:30 AM   #7
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Try mags then check gas block. It may not be perfectly aligned and causing not enough gas. The shorter barrel im sure youll need a bit more gas. Grendel and its powders usually perform well in longer barrels with longer dwell times in the barrel
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Old 09-20-2019, 10:46 AM   #8
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Quote:
Originally Posted by Walker View Post
Have you tried different ammo and do you have an adjustable gas block.
No not yet, havenít had a lot of time to run some rounds through it. But will definitely try that.

And no I donít have an adjustable block. Thatís one of the solutions I have been wondering about but a lot of things I read say adjustable blocks and different buffers supposedly aren't necessary on Grendel but a lot of folks also say otherwise.
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Old 09-20-2019, 10:50 AM   #9
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Quote:
Originally Posted by lbbf View Post
Mine did that. I changed to Elander mags and the problem went away. Maybe yours doesn't like the E-lander. I would try the single round first and work back from there. Try a standard 223/5.56 mag and only load 2 or 3 rounds and see if the problem goes away.
Yea after reading some stuff I figured Iíd try the single round. I do have another mag that I was going to try and Iíve got plenty of 223 mags to try. Wonder if steel vs pmag would make a difference
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Old 09-20-2019, 10:55 AM   #10
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I had the same problem with ASC magazines and switched to E-Landers and it stopped. I did dremel the ASC mags and it still never fixed the problem. I can send them to you or meet you around Houston if you'd like to try them.
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Old 09-20-2019, 11:07 AM   #11
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3 most likely issues for this

Mags
Gas block
buffer spring
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Old 09-20-2019, 02:21 PM   #12
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Mags are usually the main culprit with the Grendel.


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Old 09-20-2019, 05:23 PM   #13
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My 12.5" SBR's had the same issues, but didn't fail to eject as often with the elander mags. I jumped up to a 4.6oz buffer and it hasn't skipped a beat since.
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Old 09-20-2019, 06:52 PM   #14
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Looks like your running a can. My guess would be over gassed
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Old 09-28-2019, 03:41 PM   #15
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Quote:
Originally Posted by cbd10pt View Post
Looks like your running a can. My guess would be over gassed
Itís not a can, just a 1.5Ē linear comp and kinda tucked like a can.
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Old 09-28-2019, 03:46 PM   #16
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So I got to shoot some today. Only had half a box of ammo but here is what I noticed.

3 single shots locked back perfect each time.
All brass was in the 3:00-4:00 position.
If I put two in, no issue.
If I put three in, the second round was always the culprit. Did this twice.

If you look at the top of the mag, bullet pointing away, Always fed the left round. Consistently hung up on the right round. Hence the line above.

Also once did not feed the round on the right when closing the bolt. I have attached a picture of what it keeps doing.

Two FtF hang ups when firing and loading the round on the right, one hang when closing the bolt.

This is what I noticed with the limited rounds I had plus damaging a few.
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Old 09-28-2019, 03:48 PM   #17
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.
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Old 09-28-2019, 03:52 PM   #18
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Pushing rounds out of the mag with my thumb, there are a couple ribs on the mag that the extractor groove on the case really hangs up. Just wondering if this is causing it to lose its grip when it hangs up and the round tilts up the feed ramp.

Thinking thenmag lips are keeping the rounds too low and tilting gets them below the bolt face.
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Old 09-28-2019, 04:00 PM   #19
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I feel like the mag is in the proper position.
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Old 09-28-2019, 04:02 PM   #20
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.
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Old 09-29-2019, 11:28 PM   #21
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Here’s what I did to mine:
I run mine suppressed, so here’s what I did:
Pulled the upper and polished the feed ramps,
Filed a little of the ejector pin then polished,
Upgraded my buffer to a 4.6 oz.
Went from using elanders to ASC mags (the springs in the ASC mags are not near as stiff as the elanders).

After all of this, I haven’t had a hiccup in quite sometime. I run my rigs pretty dern wet as well. I know this sounds like a lot of hassle, and it felt like it when I was experiencing these issues, but I believe this is the best caliber in the AR-15 platform. Just my opinion
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Old 09-30-2019, 02:49 AM   #22
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Try a heavy buffer and extra power spring from clint at HeavyBuffers.com

What mags have you tried out?

How many Elanders do you have?

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