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Thread: Beowulf 50 or 12.7x42 AR 15
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June 20th, 2020, 08:00 PM #1Junior Member
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Beowulf 50 or 12.7x42 AR 15
I built a 12.7x42 AR with a Bear Creek 18" barrel. I loaded an Alexander Arms 10 round magazine with practice ammo and using the charging handle it will not pick up the round from the chamber and eject it. The round stays in the chamber tight and I need to use a cleaning rod to push it out. I used an after market bolt first then purchased an Alexander
Arms bolt and it made no difference. I am using Alexander Arms ammo. I took it out this morning and it fired and cycled with no failures but still will not eject a round in the chamber when using the charging handle. Any suggestions?
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June 20th, 2020, 08:04 PM #2
Re: Beowulf 50 or 12.7x42 AR 15
Extractor not grabbing the case?
Illegitimus non carborundum est
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June 20th, 2020, 09:15 PM #3Junior Member
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Re: Beowulf 50 or 12.7x42 AR 15
Why does it function when firing it? It does not pick up the cartridge only when manually cycling it with the charging handle.
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June 20th, 2020, 10:01 PM #4
Re: Beowulf 50 or 12.7x42 AR 15
I am thinking you are getting a bit of blowback assist when firing. If you inspect the cases are there any marks that might give a clue? If you take the bolt out of the gun and manually insert a case, how hard is it to get the extractor to hold it, and how well does it do so?
Illegitimus non carborundum est
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June 20th, 2020, 10:09 PM #5
Re: Beowulf 50 or 12.7x42 AR 15
Sounds overgassed to me. Gas is blowing back the BCG before the round unseals from the chamber. Thus pushing the extractor over the rim.
www.Steelvalleycasting.com is your new home for coated bullets and custom ammo.
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June 20th, 2020, 10:10 PM #6
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June 20th, 2020, 10:39 PM #7
Re: Beowulf 50 or 12.7x42 AR 15
Yep. Seen that now. Wow.
I'm tired.
Ok. So now that I'm having a moment of clarity you have a chamber issue. Sounds like the bullet is engaging in the rifling when the BCG closes. Thus cant manually extract. But once fired it's fine because the bullet is no longer stuck.
I'm betting the lead in to the rifling is very short.
Google short chamber throat on CZ pistols and you'll get the idea where I'm coming from.www.Steelvalleycasting.com is your new home for coated bullets and custom ammo.
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June 20th, 2020, 10:50 PM #8
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June 20th, 2020, 11:19 PM #9
Re: Beowulf 50 or 12.7x42 AR 15
www.Steelvalleycasting.com is your new home for coated bullets and custom ammo.
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June 22nd, 2020, 06:22 PM #10Active Member
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Re: Beowulf 50 or 12.7x42 AR 15
Check your fired case for any scuff marks / scratches from your possibly rough chamber.
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