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Old 10-16-2018, 05:11 PM   #1
Vap
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Default 6.5 Grendel help please

My new Grendel is not cycling with more than one round in the mag
The gun details I just build it
Barrel is a 20" ballistic advantage Grendel dmr rifle length
Bolt is a toolcraft 6.5 Grendel black nitride big w/ forward assist type 2
Mag is a 6.5 Grendel Elander 10 round magazine
All is new
It was shooting great for the break in period till I had to add multiple round to the mag
Any help would be greatly appreciated
Thank you VAP
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Old 10-16-2018, 05:18 PM   #2
BearStrike2010
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Do you have an adjustable gas block?
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Old 10-16-2018, 05:21 PM   #3
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No I don't
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Old 10-16-2018, 05:25 PM   #4
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When you say it's not cycling what do you mean exactly? The bolt locking back? Is it short stroking? Meaning not catching the rim of the case?
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Old 10-16-2018, 05:26 PM   #5
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1. Have you tried a different mag?
2. The gas block could be partially blocking gas port.

Exactly how is it hanging up? Is it hanging on the second round and not going to battery or is it not fully ejecting the first round when another round is in the mag.

I had a similar problem with a 223 wylde and it was my gas block not installed correctly on a already built upper.

I had problems with the mags on my 762x39.

Please post up your fix..

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Old 10-16-2018, 05:30 PM   #6
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With one round loaded in the mag it functions correct .
With multiple rounds in mag the bolt does not even pull the spent round out.
I have only one mag.
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Old 10-16-2018, 05:33 PM   #7
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With just one in the mag and is shot does the bolt lock back?
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Old 10-16-2018, 05:33 PM   #8
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With multiple rounds in the mag the spent round stays in the barrel.
Sorry a little clarity
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Old 10-16-2018, 05:34 PM   #9
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Most likely issue is listed above. I have seen a ton of short stroke issues because the gas block wasn't aligned properly. If you are short stroking, you should be able to slide the gas block down the barrel and you will see a smoke mark to one side of the gas port. A dimple jig is worth it's weight in gold is the gas block is the set screw type.
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Old 10-16-2018, 05:36 PM   #10
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Ok going to dismantle this now and check it out
Thank you vap
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Old 10-16-2018, 05:59 PM   #11
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Update
I removed the gas block and the smoke mark was 99% correct I made a small adjustment and now it extracts the spent shell and the bolt cycles but fails to load .
Thanks Vap
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Old 10-16-2018, 06:27 PM   #12
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What weight buffer are you using? This might be part of the issue. An adjustable gas block might also fix your issue. I would suggest having a gunsmith or someone experienced with trouble shooting AR's look it over.

Can you cycle the rounds through the gun manually without it hanging up? I don't really think it's a mag issue because Elanders are IMO the best 6.5 magazine out there, but it's always a possibility.
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Old 10-16-2018, 06:37 PM   #13
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Ammo is Hornaday 6.5 Grendel 123 gr. Eld match
The ammo is pretty nice I'm breaking it in and it has a decent group.
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Old 10-16-2018, 06:52 PM   #14
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Make sure your buffer isn't H Marked. As raider said. Is your stock carbine or rifle? I have had springs bind once or twice, but it isn't often.
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Old 10-16-2018, 07:17 PM   #15
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I don't see any markings on the buffer. I just weighted the buffer at 3.0 oz /85 g
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Old 10-16-2018, 07:18 PM   #16
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So you might have to open your gas port slightly. Very rarely do I see this being the problem but it does happen
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Old 10-16-2018, 07:23 PM   #17
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I have a psa moe ctr lower build kit # 7030 on my lower is this right?
Thanks
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Old 10-16-2018, 07:41 PM   #18
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Possible the gas port is too small, but I have never seen it any other caliber except blackout. Might want to take your bolt out and make sure the rings aren't lined up in there. Only other thing I got is it's possible the spring is binding, or just out of spec and too long. You could try and compare to a different spring. I am going to assume 20" with rifle length on the gas system.
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Old 10-16-2018, 07:58 PM   #19
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Lower parts kit should not effect cycling. It's going to be in your buffer, gas rings like roughneck said or a gas issue. You might have a slight blockage in your gas tube as well. You can pull it off and blow through it
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Old 10-16-2018, 08:09 PM   #20
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I took off the gas block and it is clean and was able to blow air through it and reassembled it and made A very very small move on the gas block and the bolt cycled and extracted the spent shell but fail to load
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Old 10-16-2018, 08:11 PM   #21
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Quote:
Originally Posted by BearStrike2010 View Post
Lower parts kit should not effect cycling. It's going to be in your buffer, gas rings like roughneck said or a gas issue. You might have a slight blockage in your gas tube as well. You can pull it off and blow through it
The lower parts kit was for reference on the stock being rifle or carbine length
I believe I have a carbine length
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Old 10-16-2018, 08:23 PM   #22
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It sounds like it is short stroking. Like I stated earlier it might help to open the gas port. Or you could cut off about a coil and a half at a time off your buffer spring. I would only do this about 3 times.
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Old 10-16-2018, 08:23 PM   #23
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Really starting to sound more and more like the gas rings are lined up. Not too hard to find out. Kinda running out of things to check. When you charge the rifle it doesn't have any issue feeding from the magazine right?
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Old 10-16-2018, 08:28 PM   #24
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Dont think I mentioned previously, make sure the bolt is lubed well. Ar15's don't require a lot in most areas, but that is the exception, the neck of the bolt should be shiny with oil. Doesn't have to be dripping or anything like that, but there should be a noticeable shine to it.
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Old 10-16-2018, 08:36 PM   #25
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It sounds like a magazine problem to me. You need a spare anyway.
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Old 10-16-2018, 09:00 PM   #26
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Yeah I don't like they way the gas block looks and the smoke mark is very very little off center on the barrel I'm going to start with that . I'm going to order an adjusted gas block tonight
I did have the bolt lubed up but I'll add more when I get the gas block
I did empty a full mag manually
Thank you
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Old 10-16-2018, 09:07 PM   #27
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I run 6.8spc mags for my baby 6.5
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Old 10-16-2018, 10:56 PM   #28
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Find a drill bit that matches the size of the gas port hole and clean it out By spinning the drill bit with your fingers. An adjustable gas block is only going to help if you have too much gas. If none of the above works find a slightly bigger drill bit and drill out your gas port and see what that does. If then it’s over gassed an adjustable gas block will fix the issue.
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Old 10-17-2018, 12:01 AM   #29
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I was at the range last weekend and a gentleman a couple lanes over was having a similar issue with his AR-10. I didn't catch all the details so someone here with more know how might verify.
They tore it down and it turned out there was a burr on the feed ramp I believe. Took a file and cleared it in seconds. She was right as rain after that. Possibility?


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Old 10-17-2018, 04:47 PM   #30
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I had the same with mine. A generous shot of oil and she cycles like a woman.
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Old 10-17-2018, 05:19 PM   #31
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There is a difference in failing to load and short stroking. Is the bolt picking up the next round out of the magazine and just unable to chamber it? Or is the bolt closing with the next round still sitting in the magazine? Does the bolt lock back on an empty mag?

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Old 10-18-2018, 09:10 PM   #32
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All this talk about excess lube on the bolt carrier is not going to help. Unless the carrier or upper is out of spec and binding. I run mine dirty as hell and they always feed. Sounds like the gas block is a set screw type as many times as you have had it off. The barrel dimples may be slightly off or the block/tube has an issue. I do not think an adjustable block will fix your issue unless the block is the problem to start. Adjustable blocks are for reducing gas, not adding. You can tell a gas problem by where a fired round is ejected. If a new mag and gas block do not fix the issue. You will likely be drilling the gas port or buying a jig and pinning it in the right position, or both. Gas block ports are oversized to allow for some alignment deviation. Check the barrel port specs with a drill bit. On the bolt, you should be able to put your pinky in the end and push it in the upper and watch it lock, should not be tough to pull back and watch it rotate to unlock/come out. Let us know.

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Old 10-20-2018, 08:18 AM   #33
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I'm going to through out the gas key is loose as well. Probably not the problem but an easy one to check while checking the rings. Really sounds like a gas problem to me.
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Old 10-20-2018, 12:17 PM   #34
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Wow this isn't going well still ejecting just not reloading or holding back on a single loaded mag
New adjustable gas block still not right
Checked this gas port and cleaned and checked with a drill bit
Removed bolt cleaned and checked gas rings they are not in line
Bolt is stacked and not loose
The brass is falling at 4 o'clock
Is my buffer weight or spring my next step ?
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Old 10-20-2018, 01:01 PM   #35
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My guesses: try a different gen mag, gas problem (add an adjustable block or hotter round), or a buffer length problem. Try to find a really short buffer.
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Old 10-23-2018, 02:19 PM   #36
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Spoke to Ballistic Advantage and they recommend drilling the gas port with
# 41 drill bit 0.096"
Runs and tested great Now 8 weeks till the rut!
Thank you all I appreciate all the help.
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Old 10-23-2018, 09:06 PM   #37
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What is the port spec from BA for that gas system and caliber? I think most of us suspected a gas issue, just curious what it shipped with compared to their opening recommendation. A few posts above you verified the port with a drill bit what size was that, and was that factory spec?

Heck a 5.56 can vary from .07 to .09x depending on barrel length, etc. I am guessing they went for an initial that would fire suppressed without being way over gassed. But that is just speculation. Glad you have it sorted!

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Old 10-23-2018, 09:25 PM   #38
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0.0935 is the original gas port hole.
The recommendation from Ballistic Advantage was use a #41 drill bit to open the gas port to 0.096"
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Old 10-24-2018, 08:03 PM   #39
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Thanks for the update! Sounds like it would have cycled ok with a suppressor attached. Glad they got you sorted! How does that BA barrel shoot? I have heard good things but do not own one.
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Old 10-24-2018, 09:52 PM   #40
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Still one the breaking in stage but switching to a hunting load tomorrow it should be very good . I also have a 223 wylde from B.A. And it shoot great!
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