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10/30/2020 2:42:12 PM
Posted: 11/20/2008 9:27:43 AM EST
Does anyone know why RRA 9mm uppers come with A1 flash suppressors instead of A2s?  Is there a reason - A1 works better w/9mm?  

Side issue: Do 16" 9mm barrels with regular load (Blazer Brass, WWB, etc.) 9mm produce enough flash to worry about suppressing it?  Are they as bad as 16" .223s?
Link Posted: 11/20/2008 9:39:42 AM EST
Don't think your second question is a side issue at all.  9mm Luger ammo was designed for a 5" barrel.  Wait til some heavyweights offer up their wisdom, but my guess is no supression would flash the same as a hider.  I doubt there's anything left by the time you get to the end of that 16"
Link Posted: 11/20/2008 9:45:32 AM EST
Originally Posted By engineer2001:
Does anyone know why RRA 9mm uppers come with A1 flash suppressors instead of A2s?  Is there a reason - A1 works better w/9mm?  

Side issue: Do 16" 9mm barrels with regular load (Blazer Brass, WWB, etc.) 9mm produce enough flash to worry about suppressing it?  Are they as bad as 16" .223s?


Damn good questions.  I will wait for dark and report back.

Link Posted: 11/20/2008 4:32:39 PM EST
I have a RRA 9mm upper that came with the A1 FH.  My ST-22 upper also came with the A1 FH.  Actually I dont have a scientific explanation, but I exchanged both A1s for A2s and havent noticed any change in accuracy nor recoil.
Link Posted: 11/20/2008 4:39:54 PM EST
Because that is what COLT put on them in the first place.
Link Posted: 11/20/2008 5:54:39 PM EST
Wouldn't that be a reason to do something different?  
Link Posted: 11/20/2008 6:10:45 PM EST
[Last Edit: 11/20/2008 6:12:37 PM EST by Desert_AIP]
As a pseudo-submachinegun you are unlikely to shoot a 9mm from the prone positon, thus you are unlikely to need an A2 flash hider with the closed bottom hole.

My guess, it may be a little quicker to assemble (i.e. cheaper) since you don't have to time the flash hider.

I doubt you need to worry about flash.  Look at the end of an MP-5 barrel.  
It's a lot shorter than 16" and there isn't even a flash hider on them.
Same for the Uzi.
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