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Best round in pistol AR #16157687 06/09/21
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mjbgalt Online Content OP
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Looking for a good chambering for a new pistol lower. Thinking I have enough 223 type chamberings. 300 blackout? 7.62x39? What is a good choice for the short barrel?

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Re: Best round in pistol AR [Re: mjbgalt] #16157898 06/10/21
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GaryLL1959 Offline
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Personally, unless I was going to run it suppressed all the time, I would go with a pistol round, simply because the .223, BO, or 7.62x39 are obnoxiously loud and have terrible muzzle flash / blast out of pistol length barrels.
I've got 2 in 5.56, one 7.5 inch, one 11 inch, and 1 300 BO with a 10.5 inch barrel...none of them are 'pleasant' to shoot without a can, even wearing ear plugs and muffs. I couldn't imagine touching any of them off inside a closed environment.
The 9mm, 10.5 inch, while not hearing safe by any means, is a lot more enjoyable to shoot with just normal hearing protection.


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Re: Best round in pistol AR [Re: mjbgalt] #16157929 06/10/21
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chlinstructor Online Content
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Next one I build will be a 6.5 Grendel.


"Allways speak the truth and you will never have to remember what you said before..." Sam Houston
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Re: Best round in pistol AR [Re: GaryLL1959] #16158492 06/10/21
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Originally Posted by GaryLL1959
Personally, unless I was going to run it suppressed all the time, I would go with a pistol round, simply because the .223, BO, or 7.62x39 are obnoxiously loud and have terrible muzzle flash / blast out of pistol length barrels.
I've got 2 in 5.56, one 7.5 inch, one 11 inch, and 1 300 BO with a 10.5 inch barrel...none of them are 'pleasant' to shoot without a can, even wearing ear plugs and muffs. I couldn't imagine touching any of them off inside a closed environment.
The 9mm, 10.5 inch, while not hearing safe by any means, is a lot more enjoyable to shoot with just normal hearing protection.



I love my 7.5” Saint in 5.56. It’d be hard to beat it as a truck gun. I don’t think the noise and blast is any worse than my 16 5.56 with a birdcage.

Re: Best round in pistol AR [Re: chlinstructor] #16160155 06/10/21
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Originally Posted by chlinstructor
Next one I build will be a 6.5 Grendel.

I love the Grendel have three of them. Built-in upper 10 and a half inch barrel Grendel. It makes the same length barrel on a 556 and 300 Blackout seem whisper-quiet that thing was God awful loud.

IC-A

Re: Best round in pistol AR [Re: BillyGoatGruff] #16160160 06/10/21
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BobBrown Online Content
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Originally Posted by BillyGoatGruff
Originally Posted by GaryLL1959
Personally, unless I was going to run it suppressed all the time, I would go with a pistol round, simply because the .223, BO, or 7.62x39 are obnoxiously loud and have terrible muzzle flash / blast out of pistol length barrels.
I've got 2 in 5.56, one 7.5 inch, one 11 inch, and 1 300 BO with a 10.5 inch barrel...none of them are 'pleasant' to shoot without a can, even wearing ear plugs and muffs. I couldn't imagine touching any of them off inside a closed environment.
The 9mm, 10.5 inch, while not hearing safe by any means, is a lot more enjoyable to shoot with just normal hearing protection.



I love my 7.5” Saint in 5.56. It’d be hard to beat it as a truck gun. I don’t think the noise and blast is any worse than my 16 5.56 with a birdcage.


Mostly agree. Just wish the LOP was a tad longer



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Re: Best round in pistol AR [Re: mjbgalt] #16160344 06/10/21
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Cowboybart Offline
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I like to be different, so I would use a 450 BM bolt and make a 45 Win Mag. If you are going to supress it, the round is super sonic. I don't know how you would address the magazine issue.


Some is Good---More is Better----Too Much is Just Right
Re: Best round in pistol AR [Re: BillyGoatGruff] #16160647 06/10/21
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Walker6 Offline
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Originally Posted by BillyGoatGruff
Originally Posted by GaryLL1959
Personally, unless I was going to run it suppressed all the time, I would go with a pistol round, simply because the .223, BO, or 7.62x39 are obnoxiously loud and have terrible muzzle flash / blast out of pistol length barrels.
I've got 2 in 5.56, one 7.5 inch, one 11 inch, and 1 300 BO with a 10.5 inch barrel...none of them are 'pleasant' to shoot without a can, even wearing ear plugs and muffs. I couldn't imagine touching any of them off inside a closed environment.
The 9mm, 10.5 inch, while not hearing safe by any means, is a lot more enjoyable to shoot with just normal hearing protection.



I love my 7.5” Saint in 5.56. It’d be hard to beat it as a truck gun. I don’t think the noise and blast is any worse than my 16 5.56 with a birdcage.


I haven’t experienced the 11.5” 5.56 or the 9.5” .300 BLK to be obnoxious either. Haven’t tried either indoors or without ear protection, though.

Re: Best round in pistol AR [Re: mjbgalt] #16160748 06/11/21
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Esteban325 Offline
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Grendel is pretty good. Have you considered 350 legend?

Re: Best round in pistol AR [Re: mjbgalt] #16161596 06/11/21
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MontanaMarine Offline
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I've got a couple of 5.56. A 10.5", and an 11.5".

For something different, I went with 7.62x39 with a 10.5" barrel. I chose that chambering for the availability and cost of ammo (a couple years ago). Also since I have a couple rifles in that chambering.

The 7.62x39 is nice. No regrets on that choice. 124gr does around 2150-2200 fps.

50 yard sight in,
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Churched-up with some Magpul furniture,
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Re: Best round in pistol AR [Re: mjbgalt] #16162180 06/11/21
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mjbgalt Online Content OP
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Uh oh. You put it on your shoulder. You felon, you...lol

Re: Best round in pistol AR [Re: mjbgalt] #16162264 06/11/21
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TWR Offline
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Y’all have heard of the point system and ATF’s new ruling coming out right? Get ready to pay a $200 tax stamp and SBR them. I figure that will change lots of folks ideas af what a good pistol caliber is.

Re: Best round in pistol AR [Re: TWR] #16162391 06/11/21
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antelope_sniper Online Content
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Originally Posted by TWR
Y’all have heard of the point system and ATF’s new ruling coming out right? Get ready to pay a $200 tax stamp and SBR them. I figure that will change lots of folks ideas af what a good pistol caliber is.


Something modeled on the MP-5K in 9mm is looking much more interesting....


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Re: Best round in pistol AR [Re: mjbgalt] #16162852 06/11/21
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MontanaMarine Offline
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Originally Posted by mjbgalt
Uh oh. You put it on your shoulder. You felon, you...lol


Oops.

Actually it's not on my shoulder at all.

Re: Best round in pistol AR [Re: mjbgalt] #16162873 06/11/21
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MontanaMarine Offline
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To be honest, The AR pistol was an itch I had to scratch.

Now that I've scratched it, I'm not really shooting them much. In reality, I much prefer my 14.5" pinned/welded carbines for a useful shorty, in my world.

The whole brace deal is kind of A $hitty compromise to be honest.....my take anyways.

Given current events, I'm kind of in a tossup between SBR'ing the lower, and use a proper carbine stock......or rebarrel them to 14.5" pinned/welded, and move on. I don't really think I will ever have a purpose where an SBR/pistol would be an advantage over a 14.5" P/W'd


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