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Posted: 2/16/2020 3:06:31 AM EDT
[#1]
You will likely get more and better answers in the AR Variants section but..
7.62x39 AR bolts traditionally have been known to break more frequently than their 5.56 counterparts. Having a spare bolt or 2 wouldnt be a bad idea imo. This is not exclusive to the PSA KS47, nearly all AR15 based 7.62x39 bolts share the same characteristics. The exception off the top of my head would be the CMMG Mutant which if I recall correctly is based off of an AR10 bolt and should be much more durable but is propietary to the Mutant with its AR15 sized receivers. |
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Posted: 2/16/2020 3:23:17 AM EDT
[#2]
I built 3 x39s and haven't broke one yet. Iirc at least 2 are from red x arms
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Posted: 2/16/2020 6:26:25 AM EDT
[#3]
You're talking about the one that takes AK mags, right? I don't like that it takes away the modularity of the AR15 platform.
As far as bolts breaking, look at Bear Creek Arsenal, for example, they've been pumping out 7.62x39 uppers for $200 and I've yet to hear about bolts breaking. |
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Posted: 2/16/2020 7:08:03 AM EDT
[#4]
i've got over 1k rounds through mine, most of that being mag dumps with 20s, 30s, 40s and drums
not a single issue to date |
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Posted: 2/16/2020 10:14:26 AM EDT
[#5]
Quote HistoryQuoted:
You're talking about the one that takes AK mags, right? I don't like that it takes away the modularity of the AR15 platform. As far as bolts breaking, look at Bear Creek Arsenal, for example, they've been pumping out 7.62x39 uppers for $200 and I've yet to hear about bolts breaking. OP, I have an AIM surplus bolt that's been perfect for several years. Granted, I don't shoot a lot, but I did two separate polls in the Variants section and this is what I found: https://www.ar15.com/forums/AR-15/7-62x39-Broken-Bolt-Poll-revisited-now-with-less-brain-damage-/121-737722/ The link to the other poll thread is in there. I tried to more narrowly define failure to include only bolt walls. I was only interested in repairs that couldn't be done in the field, so extractors didn't count (I always carry a spare). EDIT: Posting before coffee. I see now that you're talking about the KS-47. I thought you were talking about a standard upper with 7.62 parts in it. |
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Posted: 2/16/2020 10:41:43 AM EDT
[#6]
When I was looking into 7.62x39 AR's and looking through many threads, bolt breakages seemed to occur at 5,000 rnds or less which is roughly 1/4 the life expectancy of a 5.56 bolt. All 7.62x39 bolts based off of a 5.56 bolt will have significantly thinner walls and thus less support for the lugs particulary those next to the extractor, there is no way around that without significant redesign of the bolt and likely the barrel extension.
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Posted: 2/16/2020 11:01:30 AM EDT
[#7]
Good info, thanks!
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Posted: 2/16/2020 11:36:47 AM EDT
[#8]
Get the Mutant, it has better bolt geometry, IMHO.
I put about 6k rds thru my Mutant before I sold it. Mine was an early model that had the GB move, sent it into CMMG they cross pinned. Gun never had a malfunction afterwards. And much more accurate than any AK I have ever owned. I sold it because my SBR'd Draco has become my go to 7.62x39 gun. |
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Posted: 2/18/2020 12:25:03 AM EDT
[#9]
Quote HistoryQuoted:
Get the Mutant, it has better bolt geometry, IMHO. I put about 6k rds thru my Mutant before I sold it. Mine was an early model that had the GB move, sent it into CMMG they cross pinned. Gun never had a malfunction afterwards. And much more accurate than any AK I have ever owned. I sold it because my SBR'd Draco has become my go to 7.62x39 gun. Nutnfancy (yeah, yeah... I know...) really liked the KS47 and not the mutant. What gives? |
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Posted: 2/18/2020 4:12:31 PM EDT
[#10]
Quote HistoryQuoted:
I don't know why, but I keep hearing mixed reviews about the mutant- that it doesn't reliably feed/fire russian steel case 7.62, etc... Nutnfancy (yeah, yeah... I know...) really liked the KS47 and not the mutant. What gives? Quote HistoryQuoted:
Quoted:
Get the Mutant, it has better bolt geometry, IMHO. I put about 6k rds thru my Mutant before I sold it. Mine was an early model that had the GB move, sent it into CMMG they cross pinned. Gun never had a malfunction afterwards. And much more accurate than any AK I have ever owned. I sold it because my SBR'd Draco has become my go to 7.62x39 gun. Nutnfancy (yeah, yeah... I know...) really liked the KS47 and not the mutant. What gives? |
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Posted: 2/19/2020 2:03:55 PM EDT
[#11]
Topic Moved
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Posted: 2/19/2020 5:11:54 PM EDT
[#12]
The only negative on the Mutant is that it's based more on the AR10. Therefore it's also larger and heavier than the 7.62x39's based on the AR15. This may or may not be a concern to the OP.
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Posted: 2/19/2020 10:31:15 PM EDT
[#13]
No idea how long a 7.62x39 bolt lasts but I’ve been shooting 7,62x39 thru several ARs for years, not broken a bolt yet. Mostly surplus Yugo M67. A lot of that was thru an LMT enhanced bolt which IMHO is the best but I think they’re like $250 these days. Also run an AIM Surplus bolt, no issues.
I think Bear Creek Arsenal had 7.62x39 bolts on sale for $40 and right now Right to Bear has a complete 7.62x39 bolt kit on sale for $45. The most common failure I’ve seen is a broken extractor, they’re less than $20. That’s why I like the LMT as it uses a proprietary lobster claw extractor but they don’t sell replacements so when it breaks, I’m using my replacement spare bolt and waiting for a good sub-$50 sale. |
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Posted: 2/20/2020 7:57:58 AM EDT
[#14]
j
Quote HistoryQuoted:
No idea how long a 7.62x39 bolt lasts but I’ve been shooting 7,62x39 thru several ARs for years, not broken a bolt yet. Mostly surplus Yugo M67. A lot of that was thru an LMT enhanced bolt which IMHO is the best but I think they’re like $250 these days. Also run an AIM Surplus bolt, no issues. I think Bear Creek Arsenal had 7.62x39 bolts on sale for $40 and right now Right to Bear has a complete 7.62x39 bolt kit on sale for $45. The most common failure I’ve seen is a broken extractor, they’re less than $20. That’s why I like the LMT as it uses a proprietary lobster claw extractor but they don’t sell replacements so when it breaks, I’m using my replacement spare bolt and waiting for a good sub-$50 sale. |
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