Posts: 7
Threads: 1
Joined: Apr 2019
This is a custom build I built from parts I was told where sourced from group buys here. The barrel is a 20" faxon and the bolt has the monster logo on it. The upper is new frontier armory side charging upper and it has a wojtek weaponry clamp on adjustable gas block. The carrier is a toolcraft I took from another rifle.
When fired the bolt does not move and cases must be mortared out. I have tried e lander, AA, and CPD mags and I can manually cycle the bolt thought an entire mag without an issue.
Any help would be appreciated.
Posts: 1,691
Threads: 18
Joined: Feb 2013
Do you know for a fact the gas block is aligned properly?
Posts: 6,193
Threads: 170
Joined: Mar 2015
Sounds like the rifle isn't getting any gas at all. Double check the gas block is lined up, not closed or plugged up with something somehow.
Posts: 1,230
Threads: 6
Joined: Jun 2016
Definitely sounds like a gas issue except having to mortar out the brass. Have you checked the headspace?
Posts: 3,654
Threads: 17
Joined: Aug 2013
The gas system has no gas.
After firing with no gas it is quite normal for cases to be stuck in the chamber and have to 'mortar' them out. Those with an adjustable gas system turned fully off will know this. But you can still manually cycle properly headspaced rounds perfectly into and out of the chamber without firing.
Posts: 162
Threads: 2
Joined: May 2017
Klem Wrote:The gas system has no gas.
After firing with no gas it is quite normal for cases to be stuck in the chamber and have to 'mortar' them out. Those with an adjustable gas system turned fully off will know this. But you can still manually cycle properly headspaced rounds perfectly into and out of the chamber without firing.
Good morning Klem,
This is all new to me. When you say stuck in the chamber being normal do you mean to just tap it out or is the case really stuck normally? It just seems to me that anytime a case needs mortared out, something is wrong. Maybe to problem is greater with more straight walled cases like the Grendel???
Thank you
Posts: 7
Threads: 1
Joined: Apr 2019
I have adjusted the gas system, I had the gas block flush with the shoulder, I've offset it by .030 using a feeler gauge. I'll take it to the range later to see if that solves the problem.
Posts: 3,654
Threads: 17
Joined: Aug 2013
Gusmeister Wrote:Good morning Klem,
This is all new to me. When you say stuck in the chamber being normal do you mean to just tap it out or is the case really stuck normally? It just seems to me that anytime a case needs mortared out, something is wrong. Maybe to problem is greater with more straight walled cases like the Grendel???
Thank you
Not peculiar to just the Grendel - peculiar to the AR. I've used an Adams Arms piston in 223 with the gas set to OFF. The spent case is stuck in the chamber and requires a decent pull on the charge handle to get it moving. I've even see someone put the butt on the ground and use the heel of their boot on the charge handle but that's overkill and not something I would advise. Usually you can get it out by hand but needs more strength than usual.
Posts: 3,654
Threads: 17
Joined: Aug 2013
prudii,
Does your block require the handguard cap gap?
Posts: 100
Threads: 9
Joined: Jul 2018
I just had a similar issue with mine this week. Took it a part to clean it and found the gas key had come loose and sheared the back bolt. In process of fixing it now...
Jay
Posts: 384
Threads: 25
Joined: Jan 2017
prudii Wrote:I have adjusted the gas system, I had the gas block flush with the shoulder, I've offset it by .030 using a feeler gauge. I'll take it to the range later to see if that solves the problem.
The adj. GB you have has a hole in the top to be able to properly aline it over the gas hole of the barrel, a feature I really like,can't remember the drill bit I use but it works perfectly by putting bit shank thru top of block into barrel gas hole then tighten down. After installing GB I then install gas tube. Hope this helps.
"Wild flower, growin' thru the cracks in the street" - Problem Child by Little Big Town
Posts: 6,193
Threads: 170
Joined: Mar 2015
41bear Wrote:The adj. GB you have has a hole in the top to be able to properly aline it over the gas hole of the barrel, a feature I really like,can't remember the drill bit I use but it works perfectly by putting bit shank thru top of block into barrel gas hole then tighten down. After installing GB I then install gas tube. Hope this helps.
When did wojetk start putting that in their gas blocks? I have 3 of their adjustable gas blocks and none of mine have that.
Newest one is probably 6 to 8 months old now.
Posts: 384
Threads: 25
Joined: Jan 2017
A5BLASTER Wrote:When did wojetk start putting that in their gas blocks? I have 3 of their adjustable gas blocks and none of mine have that.
Newest one is probably 6 to 8 months old now.
I thought about that after I posted so sent email to them to get scoop have yet to receive reply. My 3 are about 2 weeks old so they are a bit newer than yours. Will post their reply when I get one. Funny thing though, I posted a positive review the same time I got their GB's which has yet to show up on their site. In it I commented on the addition of that hole, want to order more yet also want to make sure of what I'm receiving.
PS Hole still not showing in pictures on their site either???
"Wild flower, growin' thru the cracks in the street" - Problem Child by Little Big Town
Posts: 7
Threads: 1
Joined: Apr 2019
Mine doesn't have the hole on top. I am almost 100 positive i have it lined up properly however it still doesn't work. Its not hard at all to extract the cases but the bcg is not moving at all when fired. Ive tried a different BC and had the same result.
Posts: 7
Threads: 1
Joined: Apr 2019
Posts: 7
Threads: 1
Joined: Apr 2019
It still not working. Ive really got no idea at this point. Its not the bolt carrier ived tried two different ones. I cant find anything wrong with the bolt itself. Theres no obvious case damage and it will hand cycle a whole 20 rounds without issue. I plugged the chamber with a spent case and blew canned air down the gas tube and it came out the muzzle.
Im at a loss here. Probably just going to take it to a gunsmith at this point.
Posts: 7
Threads: 1
Joined: Apr 2019
It still not working. Ive really got no idea at this point. Its not the bolt carrier ived tried two different ones. I cant find anything wrong with the bolt itself. Theres no obvious case damage and it will hand cycle a whole 20 rounds without issue. I plugged the chamber with a spent case and blew canned air down the gas tube and it came out the muzzle.
Im at a loss here. Probably just going to take it to a gunsmith at this point.
https://imgur.com/a/TZi3GWT
Posts: 560
Threads: 18
Joined: Jan 2018
Before I took it to a gun Smith I would try a non adjustable gas block. All symptoms point to gas issue, a new gas block and gas tube is a cheap double check to identify the issue.
Posts: 3,654
Threads: 17
Joined: Aug 2013
I agree with Hunter...If you have to jerk fired cases out but non-fired cases manually cycle fine it means there's no gas.
Is the hole from the gas key into the carrier blocked? Does your bolt have three gas rings?
Posts: 830
Threads: 31
Joined: May 2017
Makes me wonder if the carrier was even drilled for the gas key...
