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GT98SVO
11-26-2007, 02:07 PM
What is A4, A3, A2 etc.?

What is B.U.I.S.?

Anyone shoot varmint with these?

What your favorite for a long range plinker/varmint brand?
GT98SVO
11-26-2007, 02:08 PM
back up iron sights?
ALLAN
11-26-2007, 02:37 PM
Get your reading glasses. :D

http://www.ar15.com/content/page.html?id=254
Strychnine
11-26-2007, 02:37 PM
What is A4, A3, A2 etc.?

What is B.U.I.S.?

Anyone shoot varmint with these?

What your favorite for a long range plinker/varmint brand?



The numbers (A2, A3, A4) are the generations.

A1 = fixed carry handle, teardrop forward assist, triangle handguard, (semi or full auto for M16)
A2 = adjustable rear sight, 5/8" longer stock, heavier barrel, round handguard, (semi or 3rd burst for M16)
A3 = same as A2 but with the A1 fire control group
A4 = Flattop reciever (removable carry handle), (semi or 3rd burst for M16)

There's some goof info on this here: http://dunlaparms.com/faqs/What%20is%20the%20difference%20in%20the%20M16-AR15%20A1,%20A2,%20A3,%20A4.pdf



BUIS = back up iron sight

Yes, you can definitely varmint hunt with them and its damn fun! (good optics definitely help!)


As far as favorite for varmint... I don't have one. I've done just fine with a "stock" 20" Armalite and a decent scope, but there are some guys who will tell you that you need a 24" bull barrel, $2000 optics, etc.
David
11-26-2007, 02:39 PM
BUIS means back up iron sights.

A2=Forward assist, case deflect, modifed rear sights to adjust for windage etc.

A3=Same thing as an A2 but full auto over the burst method adopted by the A2

A4=flat top upper, forward assist, case deflect, burst etc etc.

In civilian world A3 and A4 is generally the exact same thing.