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+--- Thread: 12" monster barrel and bolt (/showthread.php?tid=21267)
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12" monster barrel and bolt - Zjohnson611 - 05-18-2020
I need help I put together a 12" monster barreled grendel and it was getting hung up at first so I lubed and shot it to loosen it up and still having feeding issues with only steel case ammo. So I bought a toolcraft bolt as a spare and it won't even seat unless I push it in super hard. So I took it apart and noticed burrs on the bolt and bult lugs. I'm trying to figure out how to post pictures
12" monster barrel and bolt - Zjohnson611 - 05-18-2020
Burrs are on the monster bolt not the toolcraft have used the toolcraft bolt. Bolt has to be barely hitting the bolt lugs
12" monster barrel and bolt - Zjohnson611 - 05-18-2020
https://ibb.co/K0Q4PZh
12" monster barrel and bolt - Zjohnson611 - 05-18-2020
https://ibb.co/B2Hg023
12" monster barrel and bolt - Zjohnson611 - 05-18-2020
https://ibb.co/sPfZgSM
12" monster barrel and bolt - Zjohnson611 - 05-18-2020
https://ibb.co/KzhbzxP
12" monster barrel and bolt - VASCAR2 - 05-19-2020
Most of your pictures are of the barrel extension but I cant tell much by looking at your photos. I suggest you private message BluntForceTrauma who runs the Green Mountain Group Buy and the Monster Bolt programs.
12" monster barrel and bolt - BluntForceTrauma - 05-19-2020
Zjohnson611 Wrote:I need help I put together a 12" monster barreled grendel and it was getting hung up at first so I lubed and shot it to loosen it up and still having feeding issues with only steel case ammo.
Feed issues with ONLY steel-case? Please describe.
12" monster barrel and bolt - A5BLASTER - 05-19-2020
Zjohnson611 Wrote:I need help I put together a 12" monster barreled grendel and it was getting hung up at first so I lubed and shot it to loosen it up and still having feeding issues with only steel case ammo. So I bought a toolcraft bolt as a spare and it won't even seat unless I push it in super hard. So I took it apart and noticed burrs on the bolt and bult lugs. I'm trying to figure out how to post pictures
Ok so you built it up and were having feeding issues with steel case when useing the group buy bolt?
Then tryed a toolcraft bolt and it's worse?
12" monster barrel and bolt - Zjohnson611 - 05-19-2020
Yes which the group by bolt and then I purchased a toolcraft bolt and it wont seat in the barrel extension with out pushing it really hard. And then the bolt is stuck in. With nothing in chamber I thought I was going to break my charging handle trying to get it out
12" monster barrel and bolt - Zjohnson611 - 05-19-2020
BluntForceTrauma Wrote:Feed issues with ONLY steel-case? Please describe.It's short stroking will no pick up the next round. But worries be is the burrs on the extension that are also on the bolt so they have to be making contact
12" monster barrel and bolt - Zjohnson611 - 05-19-2020
VASCAR2 Wrote:Most of your pictures are of the barrel extension but I cant tell much by looking at your photos. I suggest you private message BluntForceTrauma who runs the Green Mountain Group Buy and the Monster Bolt programs.
Thank you if you look on the extension you can see the burrs where I believe the bolt has been hitting
12" monster barrel and bolt - Zjohnson611 - 05-19-2020
Sorry I should also add that I have no problem with either bolt in my bca barrel. Any chance the extension is just a tad off
12" monster barrel and bolt - Lastrites - 05-19-2020
Any pictures of the barrel installed in the upper receiver? Maybe the barrel rotated a touch when torquing the barrel nut?
12" monster barrel and bolt - Zjohnson611 - 05-19-2020
Lastrites Wrote:Any pictures of the barrel installed in the upper receiver? Maybe the barrel rotated a touch when torquing the barrel nut?
No I can put the barrel back on the reciever later this evening when I get home and take a pic
12" monster barrel and bolt - BluntForceTrauma - 05-19-2020
First of all, if something's wrong just send it back to me rather than suffering the hassle of trying to fix something that's not your problem. I'll check it over. See
PM for my mailing address.
But while I'm waiting for it to arrive and just to verify are you saying it WILL feed other factory ammo but will NOT feed Wolf steel-case?
12" monster barrel and bolt - Zjohnson611 - 05-19-2020
BluntForceTrauma Wrote:First of all, if something's wrong just send it back to me rather than suffering the hassle of trying to fix something that's not your problem. I'll check it over. See
PM for my mailing address.
But while I'm waiting for it to arrive and just to verify are you saying it WILL feed other factory ammo but will NOT feed Wolf steel-case?
10/4 but yes I haven't had any failures with factory brass only with wolf steel case. And I have 2 other bolts that will not seat in the in the extension unless forced in and then it feels like you are going to break the charging handle trying to pull it back out with nothing in the chamber. And the other bolts are g2g in my bca barrel
12" monster barrel and bolt - A5BLASTER - 05-19-2020
Zjohnson611 Wrote:10/4 but yes I haven't had any failures with factory brass only with wolf steel case. And I have 2 other bolts that will not seat in the in the extension unless forced in and then it feels like you are going to break the charging handle trying to pull it back out with nothing in the chamber. And the other bolts are g2g in my bca barrel
Take the o-ring off from under the extractor and see what it does with steel cased ammo.
12" monster barrel and bolt - Wethepeople - 05-19-2020
What A5 said. I had the same problem this morning w/ my monster bolt/barrel when I test cycled dummy rounds with steel case. Removed the extractor oring and it cycles perfectly.
12" monster barrel and bolt - rabiddawg - 05-19-2020
Zjohnson611 Wrote:10/4 but yes I haven't had any failures with factory brass only with wolf steel case. And I have 2 other bolts that will not seat in the in the extension unless forced in and then it feels like you are going to break the charging handle trying to pull it back out with nothing in the chamber. And the other bolts are g2g in my bca barrel
guys see the bolder part. Removing the o-ring wont help