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Joined: Sep 2023
Posts: 158
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OP
Campfire Member
Joined: Sep 2023
Posts: 158 |
AR10 build on an Aero upper & lower with a 20" Ballistic Advantage barrel. Geisselle trigger, charging handle, and all other internals. JP Enterprises complete full mass BCG, JP Enterprises captured buffer assy. Approximately 300 rounds through the rifle. About 7-8 times now, the bolt has become stuck closed with a live round in the chamber. Trigger releases, but there is no dent on the primer. I have to use a wood block or mallet and beat the charging handle to retract the bolt and live round. ..cannot pull it open even using two hands. This has occurred with different mag/ammo combinations and I can't see any obvious wear or binding points inside the reciever. Any suggestions on where to start looking for this issue? Thanks
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Joined: Dec 2016
Posts: 5,504
Campfire Tracker
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Campfire Tracker
Joined: Dec 2016
Posts: 5,504 |
When that happens is nearly always a brass case that's sized wrong or bulged from an incorrect crimp.
The easy way to extract is to "mortar" the rifle. Do that by removing the magazine and kneel down. While pulling downward/rearward on the charging handle bang the butt plate into the ground with some force. The bolt carrier is only forced forward by the recoil spring, so the impact overcomes the force of the spring and the carrier acts like a shaft hammer against the bolt which jerks the cartridge out of the chamber. Because you are pulling down on the charging handle any movement rearward of the bolt is not allowed to go back forward and "re-jam" the shell.
Note: If you have a telescoping stock collapse it all the way 1st before doing this .
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Joined: Nov 2011
Posts: 30,985
Campfire 'Bwana
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Campfire 'Bwana
Joined: Nov 2011
Posts: 30,985 |
AR10 build on an Aero upper & lower with a 20" Ballistic Advantage barrel. Geisselle trigger, charging handle, and all other internals. JP Enterprises complete full mass BCG, JP Enterprises captured buffer assy. Approximately 300 rounds through the rifle. About 7-8 times now, the bolt has become stuck closed with a live round in the chamber. Trigger releases, but there is no dent on the primer. I have to use a wood block or mallet and beat the charging handle to retract the bolt and live round. ..cannot pull it open even using two hands. This has occurred with different mag/ammo combinations and I can't see any obvious wear or binding points inside the reciever. Any suggestions on where to start looking for this issue? Thanks After you pull the stuck round, what kind of markings are on it? Rifling marks on the bullet? Marks on the neck or shoulder? Might need to paint a few rounds with a sharpie, cycle them by hand and see where they are hitting.
You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.
You cannot over estimate the unimportance of nearly everything. John Maxwell
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Joined: Sep 2023
Posts: 158
Campfire Member
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OP
Campfire Member
Joined: Sep 2023
Posts: 158 |
When that happens is nearly always a brass case that's sized wrong or bulged from an incorrect crimp.
The easy way to extract is to "mortar" the rifle. Do that by removing the magazine and kneel down. While pulling downward/rearward on the charging handle bang the butt plate into the ground with some force. The bolt carrier is only forced forward by the recoil spring, so the impact overcomes the force of the spring and the carrier acts like a shaft hammer against the bolt which jerks the cartridge out of the chamber. Because you are pulling down on the charging handle any movement rearward of the bolt is not allowed to go back forward and "re-jam" the shell.
Note: If you have a telescoping stock collapse it all the way 1st before doing this . Thank you for that tip, I'll try the " mortar" method next time. It's a non telescoping rifle length stock
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Joined: Sep 2023
Posts: 158
Campfire Member
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OP
Campfire Member
Joined: Sep 2023
Posts: 158 |
AR10 build on an Aero upper & lower with a 20" Ballistic Advantage barrel. Geisselle trigger, charging handle, and all other internals. JP Enterprises complete full mass BCG, JP Enterprises captured buffer assy. Approximately 300 rounds through the rifle. About 7-8 times now, the bolt has become stuck closed with a live round in the chamber. Trigger releases, but there is no dent on the primer. I have to use a wood block or mallet and beat the charging handle to retract the bolt and live round. ..cannot pull it open even using two hands. This has occurred with different mag/ammo combinations and I can't see any obvious wear or binding points inside the reciever. Any suggestions on where to start looking for this issue? Thanks After you pull the stuck round, what kind of markings are on it? Rifling marks on the bullet? Marks on the neck or shoulder? Might need to paint a few rounds with a sharpie, cycle them by hand and see where they are hitting. I didn't notice any markings on the bullets or shoulders, this is what has me so confused. I'm loading to mag length , minus. 002 I initially thought it was a tight chamber since I've experienced similar problems with an M1A. So I loaded up a test batch using a small base die and had the same failure.
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Joined: Feb 2006
Posts: 1,657
Campfire Regular
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Campfire Regular
Joined: Feb 2006
Posts: 1,657 |
factory ammo is OK?
Headspace is checked? I usually buy the bolt/ barrel from the same guy.
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Joined: Nov 2004
Posts: 10,018 Likes: 1
Campfire Outfitter
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Campfire Outfitter
Joined: Nov 2004
Posts: 10,018 Likes: 1 |
Check the case length too. I had that problem with soft Hornady brass in a grendel after just a few loadings. Once I trimmed the cases it was fine.
Bb
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Joined: Feb 2006
Posts: 1,657
Campfire Regular
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Campfire Regular
Joined: Feb 2006
Posts: 1,657 |
Bing Bing.. this happened to me also. Check the case length too. I had that problem with soft Hornady brass in a grendel after just a few loadings. Once I trimmed the cases it was fine.
Bb
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Joined: Jan 2007
Posts: 11,560 Likes: 3
Campfire Outfitter
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Campfire Outfitter
Joined: Jan 2007
Posts: 11,560 Likes: 3 |
funny part is this profile has been to let himself known that he is genius on everything. and it comes out he's having such simple issues and from California this is [bleep] hilarious
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Joined: Sep 2023
Posts: 158
Campfire Member
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OP
Campfire Member
Joined: Sep 2023
Posts: 158 |
funny part is this profile has been to let himself known that he is genius on everything. and it comes out he's having such simple issues and from California this is [bleep] hilarious Thanks for the insightful reply. Are you angry because your goat rejected you this morning or because your EBT card was denied at Dollar General? Either way, I hope you have a great week. GfY
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Joined: Jan 2007
Posts: 11,560 Likes: 3
Campfire Outfitter
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Campfire Outfitter
Joined: Jan 2007
Posts: 11,560 Likes: 3 |
funny part is this profile has been to let himself known that he is genius on everything. and it comes out he's having such simple issues and from California this is [bleep] hilarious Thanks for the insightful reply. Are you angry because your goat rejected you this morning or because your EBT card was denied at Dollar General? Either way, I hope you have a great week. GfY you're gleaming intelligence on what you know about people just come shining through don't it... not sure yet which your other profile was that got ran off but I can see you're still butt hurt about that.
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Joined: Sep 2021
Posts: 4,016
Campfire Tracker
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Campfire Tracker
Joined: Sep 2021
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Pretty easy to spot the reincarnated...
The real question is - who were they in their previous life. Hummmm
Si Vis Pacem, Para Bellum
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Joined: Feb 2004
Posts: 19,212 Likes: 2
Campfire Ranger
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Campfire Ranger
Joined: Feb 2004
Posts: 19,212 Likes: 2 |
I'm not trying to sell anything but a Hornady comparator opened my eyes to some sizing issues I was having. I already had the electronic calipers so my investment was small. I get the feeling that the op is not squeezing down his brass enough while resizing.
kwg
For liberals and anarchists, power and control is opium, selling envy is the fastest and easiest way to get it. TRR. American conservative. Never trust a white liberal. Malcom X Current NRA member.
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Joined: Sep 2014
Posts: 21,816 Likes: 2
Campfire Ranger
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Campfire Ranger
Joined: Sep 2014
Posts: 21,816 Likes: 2 |
Measure fired brass.
And several times around the circumference.
Egg shaped chambers can cause these issues.
Parents who say they have good kids..Usually don't!
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