7.62 in an Ar?? Ground breaking or Gun busting?

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Slink300

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I’m currently selling my .300 Blk upper on here with intentions to purchase a x39 upper for my ARP.
I’ve read a lot sayin that it’s not a great rifle configuration, reliability wise, though with a stronger hammer spring and enhanced pin this can be mitigated. But reading can only teach you so much and am seeking the opinion of residential internet experts.
But what’s y’all’s opinion on the round-rifle combo? And in your response state your experience with it i.e. owned one, shot a buddy’s, rented one at a range.

My main reasons for this desired conversion is I enjoy the extra oomph of the x39 and think the cheaper ammo would allow me to shoot more often.

Have a blessed day.
 
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Dave951 said:
Why switch? The 300BO is ballistically almost exactly the same as 7.62x39. You gain nothing and open a can of reliability worms.

If ammo price is the issue. Learn to reload.
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Fair point, if I was in the position to learn to reload. I would. But I can’t. 20¢ a round compared to 90¢ is a substantial difference. Especially when that 20¢ round is much more fun to shoot.
 
Well if the x39 ammo is the less expensive choice, know this, it's made overseas to a price point. It ain't the most accurate round especially when compared to domestic made 300BO.

Example- conventional knowledge an AK is inaccurate garbage. Here's why, most AKs in this country were made from cast off commie seconds and worn out crap. They were then finished real nice and sold as "new" guns but the barrels, tolerances, etc....... not so good. As if that wasn't enough, the flood of combloc milsurp ammo that flooded the US for a while was equally poorly made. It'd go bang, but don't think of accuracy in the same sentence. I've pulled some down and the bullet weights varied by as much as 10gr either way and powder charges differed by as much as 5gr. Taken together, not a recipe for accuracy.

Now let's think what happens with foreign made x39 in an AR platform, again, not optimum. It's likely to go bang, cycle and function, but 300BO accuracy? Not hardly.
 
I just put together another 10.5” pistol in x39. I haven’t ran as many round through it as my other guns in the same caliber yet, but it functions. I did use an enhanced firing pin. But it’s got a CMC drop in 3.5lb flat trigger. I’ve never had an issue with any of mine and I have a couple with several thousand rounds through them. Is it a 500 yard gun? Nope. But is a 300 either? I’ve not sat my newest one down on a bench amd shot it for groups at 100 yet. So I can’t say. But I will soon.If you’re wanting suppressed, 300 makes more sense.
 
5.45x39 was all the rage a dozen years ago, when crates of 1,200rds were going for $149. It was corrosive, but my favorite carbine (class) instructor was rockin' one.

Once THAT dried up, so did the 5.45x39 AR love. I don't even see them offered on Armslist anymore. Not sure where they went to die, but die they did. And yet, they're STILL more popular (and work BETTER) than 7.62x39 AR's EVER worked. 😳

As someone pointed out - .300 Blackout is the same ballistic, that works MUCH better in an AR receiver.
 
One of the concerns of the 7.62x39 in an AR is the higher bolt face thrust. It has a higher rate of failure, shearing the lugs off. The additional thrust is due to the extra taper of the x39 case. The case doesn't grip the chamber walls as much, overworking the bolt.
The x39 tapers 0.047" vs. the BLK 0.015"
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20210803_064608.jpg
 
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If you want the option to run it, get the 7.62x39 upper, but Id not get rid of the 300blk upper...

Can a 7.62x39 ar work? Yes. Does it have its problems? Very much so.

Magazines are a huge one. (The ones that work, in your specific gun, are important)
Bolt issues are another. ( how many spares do you want to have "just in case"? 5.56mm bolts are already a concern. Now try to find quality spare ones for 7.62x39...)
Geometry issues that preclude good feeding. (7.62x39 hates the straight magwell design)
"Enhanced" firing pins. ( using commercial ammo? Could end up punching a primer, firing pin breaks? Hope you have spares if things are stupid. Like now.)
Fcg issues. ( people hate when a trigger doesnt work the way they want for trigger pulls... heavy springs mean more weight. Likely wont be the same)
Accuracy expectations. ( cheap 7.62x39 is cheap, and the "problem" of accuracy is overblown... but it may not shoot the way you want it to. Especially vs 5.56 or .300.)

Not saying dont do it at all, but keep in mind it is a SIGNIFICANT compromise of the ARs strengths.

I wouldn't want one as my only option...

If I were you and wanted to run some 7.62x39 and wanted it out of a small package, Id suggest finding one of the several quality AK pistol varients and add a Bonesteel brace to it, and be happy... it WILL work, and it WILL not be a problem to keep working.

In short: tenor (4).gif
 
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I have a KS47 that I got a few months back. I had read a lot of people were having issues with the extractor but figured I would take a chance on it. Things were going pretty well until my extractor completely broke off during the first 100 rounds.
 
I have a BCA 7.62 upper on a PSA lower I slapped together ~3 years ago. The spring and firing pin are the ones that came in the upper and lower. CPD mags. It has had two failures to fire in 1000 rounds. Red Army ammo. Hit the primer plenty hard, just no bang.
Accuracy is at least moment of man at 100. I put this together for the same reason you did. Cheap fun at the range. I have not been disappointed.
 
Line up 50 rounds of steel x39 ammo, primer up. Now look for low and high primers.
That is a giant issue for reliability.
"Enhanced" FP just means it sticks out further.
That means breakage is more likely.

"Hit it plenty hard but no bang"
Yup, that's because the FP seated the primer.

If you plan to use steel X39 ammo and reliability is your goal, stick with 300 BLK.

If occasional stoppages are ok and you don't have a herd of turtles raining down on you, them go for it.
Mags are finicky, ammo is inconsistent and it's tough to tune a AGB.
 
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You guys are really selling this
 
Have gun-will travel said:
7.62 x 39 belongs in an AK. Why try to improve on perfection . Buy your self an AK and keep the 300 BO in your AR.
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This is the route I took, I’ve looked into the one PSA ks47 and to me it’s a little weak in some areas....now the cmmg Mutant is a beast and is heavy if not as much a milled ak.

The 300 blackout is a awesome round and the 7.62x39 is also, you can’t go wrong with either one, have fun and do what you want!! You’re the shooting what you want and that’s all that matters!!
 
Slink300 said:
I’m currently selling my .300 Blk upper on here with intentions to purchase a x39 upper for my ARP.
I’ve read a lot sayin that it’s not a great rifle configuration, reliability wise, though with a stronger hammer spring and enhanced pin this can be mitigated. But reading can only teach you so much and am seeking the opinion of residential internet experts.
But what’s y’all’s opinion on the round-rifle combo? And in your response state your experience with it i.e. owned one, shot a buddy’s, rented one at a range.

My main reasons for this desired conversion is I enjoy the extra oomph of the x39 and think the cheaper ammo would allow me to shoot more often.

Have a blessed day.
Click to expand...
Get digital palidan to build you one of these. Not cheap but very worth itIMG_20210204_112556128.jpg
 
I've had a 16" 7.62 x 29 AR. It had some issues, but I didn't keep it long enough to work it out. I liked it, but let it go. Recently bought a 7" PSA 7.62 x 39 pistol upper. I've shot @100 rounds or so out of it with maybe one malfunction that was a poorly loaded (not in magazine properly) round. I've shot it with ASC and Pro Mags. Like it enough that I ordered a 10.5" Bear Creek one, as the 7" was a bit loud for my tastes. LOL. If you're ever near Boone, your welcome to shoot mine.

GregB
 
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