AR Bolt Release questionThis is a discussion on AR Bolt Release question within the AR Talk forums, part of the Long Gun Talk category; Finally got to put some rounds through my AR for the first time today. I kept having one problem repeat itself over and over again ...
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12-26-2010, 06:08 PM
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#1
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XDTalk 500 Member
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AR Bolt Release question
Finally got to put some rounds through my AR for the first time today. I kept having one problem repeat itself over and over again though. After I shot the last round of a mag, the bolt would lock back like normal. I'd insert a fresh mag and hit the bolt release button, but the bolt would not fully chamber the round. It would only push the round about half way out of the mag. I'd have to pull back and release the charging handle to get the bolt to slam home. It happened on every mag, both c-products mags and P-mags. I shot around 300 rds and on each mag I'd had issues with the bolt. Once the first round was in, it ran fine. I could pull the trigger as fast as I could with no problems. Any ideas on what could be keeping that first round from chambering properly. Oh, and I was using both Federal brass cased ammo and wolf steel. Happened on both.
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12-26-2010, 06:10 PM
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#2
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XDTalk 2K Member
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How many rounds were in the "new" mag you were trying to insert?
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12-26-2010, 06:19 PM
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#3
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What brand/model of rifle? Is it new, or just new to you?
Have you inspected the feed ramps for burrs and correct alignment?
If it isn't the mags, and it isn't the feed ramps the only thing i can think of off hand is the buffer spring isnt as strong as it should be.
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12-26-2010, 06:34 PM
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#4
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All of the mags had 30 rds. And the rife is a brand new build. Spikes lower with sabre defense upper. Just tried to load a round and still doing the same thing. Took a few pics to show you guys.
Thats as far as the bolt would push the round. If I pull back and release the charging handle, it will get it the rest of the way.
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12-26-2010, 07:17 PM
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#5
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XDTalk 1K Member
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Looks to darn dry. Try it again but first lube the heck out of the bolt
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12-26-2010, 07:27 PM
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#6
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XDTalk 100 Member
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yeah lube and i would not use the wolf ammo it did nothing but jamb and double feed for me. and i read that they recommend you clean your gun very good after you use the wolf before going to brass.
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12-26-2010, 07:33 PM
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#7
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It *may* be the picture, but it looks to me like the rim isn't getting underneath the extractor and onto the bolt face.
Can you get a picture into the breech with the bolt locked back and a mag inserted? Just to see how everything is lining up.
Also, it looks suspiciously like the rim of the case is hanging right where the feed ramps are. Both the barrels and the upper both have the same feedramps right?
Matter of interest, have you tried loading only 29 rounds into the mag an seeing if the 1st round chambers then?
Oh and yes, using brass after using wolf can be quite bad. The steel doesn't expand like brass does when fired, so you get a TON of buildup in the chamber around the case. Then when you go back to brass without cleaning the brass expands into the buildup and can get VERY stuck.
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12-26-2010, 07:50 PM
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#8
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As much as I dislike Wolt ammo it looks like more of an alignment/timing problem versus and ammo problem especially if it's only the last round in the mag. Looks like your bolt is riding up on top of the round instead of hitting it from behind. Unless the Wolf cases are out of spec in the back I'd be looking at the mag springs, feed lips, or how high the mag sits in the receiver. Since that last round is when your mag spring is the weakest, it's possible that bolt is just not coming back far enough to get behind that last round. If you have an adjustable gas block turning up the gas a bit could help. If this is a scratch build I would suggest making sure you have the right buffer spring.
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12-26-2010, 07:57 PM
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#9
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Quote:
Originally Posted by Dirty Rod
As much as I dislike Wolt ammo it looks like more of an alignment/timing problem versus and ammo problem especially if it's only the last round in the mag. Looks like your bolt is riding up on top of the round instead of hitting it from behind. Unless the Wolf cases are out of spec in the back I'd be looking at the mag springs, feed lips, or how high the mag sits in the receiver. Since that last round is when your mag spring is the weakest, it's possible that bolt is just not coming back far enough to get behind that last round. If you have an adjustable gas block turning up the gas a bit could help. If this is a scratch build I would suggest making sure you have the right buffer spring.
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Hey, Dirty, he said that the jam only happened when he tried to chamber the first round by using the mag release. This has nothing to do with the cycling of the action during firing...works fine then.
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12-26-2010, 08:24 PM
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#10
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Let's have a good look at the feedramps.
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AR Bolt Release question
