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View Full Version : Oversized muzzle device bore - Impact on flash and accuracy


JediGuy
03-23-23, 07:43
I am putting together a couple lightweight carbines for my older children who have started going to the range with me. I have one 14.7” pencil BA barrel and plan to pick up a couple more, though I’m not married to that. I would prefer to set these up to use suppressors, though that is not how I started.

I have a Dead Air Micro flash hider on my 300 BLK, which is actually designed for 9mm.

If I drop these on a 5.56 barrel, is the flash suppression going to be that much less than an A2?
lysander
03-23-23, 08:29
If I drop these on a 5.56 barrel, is the flash suppression going to be that much less than an A2?

It might, but I doubt you will notice it that much without time lapse photography . . .
markm
03-23-23, 09:06
The thread pitch is the same??
DG23
03-23-23, 09:19
I am putting together a couple lightweight carbines for my older children who have started going to the range with me. I have one 14.7” pencil BA barrel and plan to pick up a couple more, though I’m not married to that. I would prefer to set these up to use suppressors, though that is not how I started.

I have a Dead Air Micro flash hider on my 300 BLK, which is actually designed for 9mm.

If I drop these on a 5.56 barrel, is the flash suppression going to be that much less than an A2?

Have a pair of .223 match barrels that I had threaded for 5/8x24 and run .308 A2 flash hiders on usually / most often. I cant tell a licks worth of difference in flash suppression between them and a regular 5.56 setup with a regular 5.56 A2.
markm
03-23-23, 09:26
Have a pair of .223 match barrels that I had threaded for 5/8x24 and run .308 A2 flash hiders on usually / most often. I cant tell a licks worth of difference in flash suppression between them and a regular 5.56 setup with a regular 5.56 A2.

Shooting some H335 in low light would be a good test. That powder is camera flashy.
DG23
03-23-23, 09:38
Shooting some H335 in low light would be a good test. That powder is camera flashy.

That and TAC are 'mostly' what I use and stock heavy on.

And yes, without a flash hider those same barrels (and same ammo) will light the shit out of a very well lit room every time you pull the trigger. :)
markm
03-23-23, 09:39
That and TAC are 'mostly' what I use and stock heavy on.

And yes, without a flash hider those same barrels (and same ammo) will light the shit out of a very well lit room every time you pull the trigger. :)

So it would seem the big FH works good. I've never noticed TAC to be flashy, but H335 and a chamber brake are comical. I only keep a lb of H335 on hand for that reason. It's hollywood cool.
JediGuy
03-23-23, 16:12
Thanks guys


The thread pitch is the same??

Yep, they make a version in 1/2-28
markm
03-23-23, 16:37
Yep, they make a version in 1/2-28

That's handy.
Duffy
03-28-23, 17:08
We saw a noticeable difference between an A2 sized AR10 flash suppressor with 0.338 bore and another with 0.462" bore.
fedupflyer
03-28-23, 18:06
We saw a noticeable difference between an A2 sized AR10 flash suppressor with 0.338 bore and another with 0.462" bore.

Can you expand upon that statement?
Would that be a difference in accuracy or flash?
Duffy
03-28-23, 18:56
Sorry difference is flash suppression. When we decreased the bore size, flash suppression performance was on par with the slightly longer Armalite "A2" flash suppressor. When the bore size was larger, the difference was noticeable in slow motion videos and pictures we took, alas I erased the footage long ago.
markm
03-28-23, 21:57
alas I erased the footage long ago.

I'm sure everyone here trusts your word. But in the context of the OP's concern, the difference to the naked eye is probably negligible.
Duffy
03-29-23, 09:18
I spent 10 minutes looking for the pics of the larger bore 6310, the results were surprisingly bad. We had used the bore size from an old Dutch AR10 flash suppressor print, the fireball shrank considerably when we used the A2 TDP bore size instead, all other dimensions remained unchanged.

This is a comparison between the Armalite AR10B "A2" and 6310, 6310 is as long as the TDP A2 compensator, the Armalite A2 is slightly longer. Over the years, we had made suppressor mount versions of 6315 shorter to fit some sound suppressors that require a very short muzzle device/mount, the flash suppression performance wasn't impacted as much as we had thought, the shorter 6315 performed almost as well as the A2 sized 6315, this mirrors our findings back in 2018 when we shortened the AR10B flash suppressor to TDP A2 length. Anyway, something interesting I thought I'd share, unrelated to the OP's question.

https://www.forwardcontrolsdesign.com/assets/images/6310flash.JPG

To the naked eye, you're correct, we couldn't tell the difference between prototype #1 and #2.
markm
03-29-23, 09:45
I'd love to get our buddy's auto lower under my Rainier comp/brake. It's comically flashy in semi auto, but a full auto video would be insane.