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Old 07-18-2014, 09:01   #1
ancy
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Anyone making or have made a 7.62x39 pistol? Toss up 9mm, 5.56, 300BO, or

Working on a pistol build and was thinking 300BO but cost of ammo and availability(even though I do reload) got me rethinking. If I want to stick with 7.62 why not make it 39?? Then again what's it take to do 9mm, as I already have my lower? 5.56 seems like the easy one but I don't enjoy the shock wave and noise of my 12" T/C Contender .223. Not that suppressors are legal here in Iowa yet but they are working at it and I'll own some when it passes, so need to think about that too! Got to love building your own guns!
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Old 07-18-2014, 10:04   #2
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Last year, I decided to finally build an AR pistol. For me, I prefer to keep with the 5.56/.223. It makes finding parts easy and readily available, in most cases. If you use a barrel chambered for 5.56 NATO, you can use the 5.56 or .223 ammo. I also run a M16 BCG with a upgraded extractor spring and buffer. I only feed it XM193 5.56 ammo (brass-cased). It is reliable ammo and you always want to make sure that you can depend on your ammo to function well in your AR. I have installed a Noveske KX3 "Flaming Pig" muzzle device to cut down on the flash and a little of the noise. It does very well. KAK makes one very similar out of aluminum and it is considerably cheaper. The jury is still out on that one. Although it looks similar, I do not know that it performs as such. Good luck with your decision.

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Old 07-18-2014, 13:31   #3
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I've yet to see a 7.62x39 AR that's worth a crap.
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Old 07-18-2014, 13:57   #4
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Built my 300BO as a pistol before my stamp came in. If you shoot more than a couple mags a year, you'll want to reload for it. I'm currently working on a 9mm build. There is a price premium for the 9mm. Probably about $300-400 more than a 5.56 due purely to the 9mm specific parts (mag block, bolt, barrel).

Here is my 9mm in-progress:
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Old 07-18-2014, 14:06   #5
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So is the 9mm lower different? I've built many 556 rifles but my first pistol and may be my first none 556.

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Old 07-18-2014, 14:18   #6
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So is the 9mm lower different? I've built many 556 rifles but my first pistol and may be my first none 556.

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Yes, it is,......sorta. You can either use a dedicated 9mm lower receiver like one from CMMG or you can use a receiver block. Getting the block adjusted is rather easy, I prefer dedicated receivers. Colt and Metalform are the preferred mags to use
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Old 07-18-2014, 17:01   #7
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Yes, it is,......sorta. You can either use a dedicated 9mm lower receiver like one from CMMG or you can use a receiver block. Getting the block adjusted is rather easy, I prefer dedicated receivers. Colt and Metalform are the preferred mags to use
Do you have a link the the blocks you like? To bad there isn't one that takes Glock mags!

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Old 07-18-2014, 17:50   #8
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Do you have a link the the blocks you like? To bad there isn't one that takes Glock mags!

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I don't like the blocks........I would suggest the CMMG dedicated lower. There is a company starting up following the utter failure of DDLES. Check AR15.com.....tons of info there. Look for a company called QuarterCircle10, it is located in Tucson AZ. they are also on GunBroker
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Old 07-18-2014, 18:36   #9
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Quote:
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I've yet to see a 7.62x39 AR that's worth a crap.
Oh they work great if you are fine with 10 round mags. It's the mags that make it so hard to be reliable. 30's suck with the AR because the lower design.
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Old 07-18-2014, 18:39   #10
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^^^^ What he said......
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Old 07-18-2014, 19:14   #11
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Oh they work great if you are fine with 10 round mags. It's the mags that make it so hard to be reliable. 30's suck with the AR because the lower design.
So, not worth a crap
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Old 07-18-2014, 19:21   #12
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So, not worth a crap


I wouldn't want to be limited to 10 rounds in the AR platform regardless of caliber.
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Old 07-18-2014, 19:23   #13
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So, not worth a crap
Yep.......that's about right!
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Old 07-18-2014, 21:16   #14
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Well maybe do 556 now and swich the barrel out with 300BO when I can get my suppressor.

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Old 07-18-2014, 21:53   #15
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So, not worth a crap
Good if you live in a Commie state I suppose. But I'm not interested in it with just 10 rounders.
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Old 07-19-2014, 06:26   #16
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Good if you live in a Commie state I suppose. But I'm not interested in it with just 10 rounders.
I am....when they are the last ten in the range bag! What about loading a faster powder for the short barrel in 556?

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Old 07-19-2014, 07:13   #17
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I am....when they are the last ten in the range bag! What about loading a faster powder for the short barrel in 556?

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I would recommend finding out what the specs are for the particular powder/bullet grain. The last thing you want to do is discharge a round that is over pressured. That can lead to a dire consequence. Like I said in my earlier post, run the XM193 5.56 55gr. ammo or even the XM855 62gr. ammo. These are military spec loads. As long as you use a good quality 5.56 chambered barrel, you would be good to go.

As far as swapping out to a .300 BLK barrel later, just buy a .300 BLK upper assembly. That way you can swap complete uppers and be able to shoot both calibers using the same lower.
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Old 07-19-2014, 09:29   #18
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I would recommend finding out what the specs are for the particular powder/bullet grain. The last thing you want to do is discharge a round that is over pressured. That can lead to a dire consequence. Like I said in my earlier post, run the XM193 5.56 55gr. ammo or even the XM855 62gr. ammo. These are military spec loads. As long as you use a good quality 5.56 chambered barrel, you would be good to go.

As far as swapping out to a .300 BLK barrel later, just buy a .300 BLK upper assembly. That way you can swap complete uppers and be able to shoot both calibers using the same lower.
I'll be rolling my own ammo, just seeing if anyone has tried a faster powder. If I have an upper built I'd most likely just switch barrels than uppers. First need to get the suppressor bill through!

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Old 07-19-2014, 12:28   #19
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I'll be rolling my own ammo, just seeing if anyone has tried a faster powder. If I have an upper built I'd most likely just switch barrels than uppers. First need to get the suppressor bill through!

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Buying a complete .300 BLK would cost just a little more than the barrel itself. Plus you do not have to concern yourself with all of the disassembly and reassembly involved with swapping barrels. It just makes more sense to me, but that is me using my common sense.
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Old 07-19-2014, 19:29   #20
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Buying a complete .300 BLK would cost just a little more than the barrel itself. Plus you do not have to concern yourself with all of the disassembly and reassembly involved with swapping barrels. It just makes more sense to me, but that is me using my common sense.
I have found barrels for around $125-150 and uppers around $350-400. It would be a one time switch after the suppressor bill passes. Sorry I'm not one to switch uppers when lowers are so cheap....common sence to me!

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