Ideal AR Pistol Barrel Length?

PorP · Apr 24, 2019

ralph.mclean said:
My 7.5 inch had a horrible muzzle blast issue. It was like getting blasted in the eyes with a camera flash from 3 feet away. Once I put a Kak flash can on it, it became a pleasure to shoot. My advice about barrel length is to decide what size suppressor you might eventually end up getting, and whether or you want to be able to extend a handguard out over it. In that case, the shorter the better...

Exact advice I got from a friend at Freds. I have several 16'ers and wanted something shorter. I've got most of it finished and waiting on the brace and orward blast diffuser. Hopefully I'll get to shoot it this weekend.

smokey · Apr 24, 2019

outrider58 said:
ETA: This has nothing to do with you, erwos - Anyone considering short barreled rifle-ammunition guns needs to have realistic expectations. I chuckle whenever I hear 'velocity' mentioned in these threads. SBRs, whether pistols or carbines, are made for one primarily purpose. Urban-style combat. Clearing buildings, room by room. Secondarily, they can make good home defense weapons as well.

In that case, check out the energy numbers in comparison of 300 and 5.56. The 8" ftlbs for 5.56 is 749. 300 at that barrel length puts out 1027 from the given loads. This is done with much less noise/flash. It's just a more efficient and overall better cartridge for a shorter barrel. You also have that versatility to go with subsonics if you wish to do that for some reason.

outrider58 · Apr 24, 2019

That's why i also have a 300 blk SBR

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smokey · Apr 24, 2019

outrider58 said:
That's why i also have a 300 blk SBR

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Haha gotcha

OLM-Medic · Apr 28, 2019

What about 12.5"? I was always interested in how one would perform out to say, 500 yards with a scope. Done it with a 14.5" so I can't imagine its much worse. That would be a handy little scoped pistol.

smokey · Apr 28, 2019

https://palmettostatearmory.com/psa...Avantlink&utm_medium=Referral&utm_campaign=cl

cap6888 · Apr 28, 2019

I HAD a 7.5 inch. It was obnoxious to shoot. Muzzle blast, noise, concussion. Switched to a 10.5 inch barrel. Much better.

Also have a 12.5. It is quickly becoming my favorite.

All this talk of 26 OAL and fore grips has me wondering. Does that mean it gets registered as an AOW? Still need to Form 1 it on a stamp?

04RWon · Apr 29, 2019

cap6888 said:
I HAD a 7.5 inch. It was obnoxious to shoot. Muzzle blast, noise, concussion. Switched to a 10.5 inch barrel. Much better.

Also have a 12.5. It is quickly becoming my favorite.

All this talk of 26 OAL and fore grips has me wondering. Does that mean it gets registered as an AOW? Still need to Form 1 it on a stamp?

Not an aow, its just a firearm when its over 26”
Want to get really confused? Read the atf letter than talks about how to measure. “Stock extended to the extreme length”. Well its a pistol so its not a stock, but well go with that. Back then the sba3 didn’t exist. The thought was measure from the barrel not counting muzzle device, to the tip of the buffer tube. That wording says otherwise.

cap6888 · Apr 29, 2019

04RWon said:
Not an aow, its just a firearm when its over 26”
Want to get really confused? Read the atf letter than talks about how to measure. “Stock extended to the extreme length”. Well its a pistol so its not a stock, but well go with that. Back then the sba3 didn’t exist. The thought was measure from the barrel not counting muzzle device, to the tip of the buffer tube. That wording says otherwise.

Of course. Clear as mud.

tmo8320 · Apr 29, 2019

I have no basis for reference. I have an AR pistol. It is chambered in 300 BLK and is 10.3”

It seems to be...a little lively?
Could just be I literally don’t know what I am doing yet

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DaemonAssassin · Apr 29, 2019

OLM-Medic said:
What about 12.5"? I was always interested in how one would perform out to say, 500 yards with a scope. Done it with a 14.5" so I can't imagine its much worse. That would be a handy little scoped pistol.

I have a 12.5" 556, with a red dot on it. It is by far my favorite and I love what it can do. It has the potential to be sub-MOA if I use the right ammo and do my part. But then again, I did float the barrel and lap the upper.

Shamr0ck · Apr 29, 2019

DaemonAssassin said:
I have a 12.5" 556, with a red dot on it. It is by far my favorite and I love what it can do. It has the potential to be sub-MOA if I use the right ammo and do my part. But then again, I did float the barrel and lap the upper.

Sounds like a fun next project....

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DaemonAssassin · Apr 29, 2019

Shamr0ck said:
Sounds like a fun next project....

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You were the when I assembled 2 of them.

calicojack · Apr 29, 2019

Hmm - 300 black, or 5.56, or both ?

calicojack · Apr 29, 2019

DaemonAssassin said:
I have a 12.5" 556, with a red dot on it. It is by far my favorite and I love what it can do. It has the potential to be sub-MOA if I use the right ammo and do my part. But then again, I did float the barrel and lap the upper.

What parts did you use for that build, if I may ask?

DaemonAssassin · Apr 29, 2019

calicojack said:
What parts did you use for that build, if I may ask?

I'll have to get to a computer to get you a full parts list. Give me a little bit?

DaemonAssassin · Apr 30, 2019

calicojack said:
What parts did you use for that build, if I may ask?

calicojack · Apr 30, 2019

DaemonAssassin - thanks!

3paul10 · Apr 30, 2019

Wait, is DaemonAssissin claiming he knows what hes doing again??

DaemonAssassin · Apr 30, 2019

3paul10 said:
Wait, is DaemonAssissin claiming he knows what hes doing again??

A broken clock can be right twice a day, dontcha know?

Ideal AR Pistol Barrel Length?

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