I would like to know this as well.
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I haven't shot my Colt in low light yet but I'd imagine it would work well though. My friend lives in a state where he has to have a plain barrel and as a result it has a flash in the daytime. i would think the A2 would work just fine. I know from night shooting that the flash suppressor on my M1A works great.
added text: standard GI flash suppressor on the M1A
Nothing better than a case with no shipping and no tax
on the internet....at least it was like that in the ol' days!
I have the BCM extended A2 on my 14.5 carbine. I have not noticed any difference from the standard A2
Seriously, I have never heard anyone being concerned with lot numbers, just shoot the damn stuff!
FWIW, I put an old-style A1 3-prong on one of my guns for the retro look. I timed the A1 to have prongs at 12, 4, and 8 o'clock so as not to have it venting straight up in front o me. I noticed less flash than with the A2 when shooting milsurp.
I know the A1 is supposed to snag brush, but that's not a concern for me.