The ACOG was built around the AR to a degree - short eye relief, day/night illumination, mounted optic height - but that's not that major a concern.
Learning precision rifle skills starts just as much with iron sights as it would with combat or higher powered glass. If having to learn math and use clicks on glass is going to dissuade you, this may not be your game.
I know I can take an M4 with TA31 off the rack and make hits at 550yds using M855 no problem, but I doubt I couldn't do as well for exclusive long range use taking a fudd Leupold VX-II with duplex reticle and running it. Flexibilty is where the ACOG shines, which usually isn't as necessary on a rig for shooting farther out in the .223 ballistic envelope.
For the dual illuminated ACOGs, the BAC (using the bright illuminated center of the reticle as a focus point and treating it like an occluded eye gunsight until the magnified image in your other eye becomes clearer) works well for a lot of people (horribly for folks with mixed eyesight).
I'm not sure how those two applications would overlap for you though - a 16" all-purpose carbine is all I can figure you'd need that for.
Longer barrel means more velocity - makes a bigger difference past 500m.
A 14.5" barrel can still put bullets into a tight group at 600m, but lethality even with OTM rounds starts falling off fast.
A 20" barrel, or even 24" would be great for F class, but only really shines because of marginally increased fragmentation range - having had the privilege of humping an M16 in and out of armored vehicles, it's probably not a #1 choice.
The 16" and 18" intermediate barrels are probably what you're after.
The optics in this range will be anything from the 3.5x TA11 up to a 2.5-10x or higher magnification - there's too many options to break this down, and you don't have to be stuck with the ACOG.
ACOGs fill a niche for high durability optics that aid with target discrimination (4x zoom, good glass) and BDC reticles for reasonably fast hits at longer range - not so much precision hits at range. They're a great pairing for military carbines, but as good as they are the variable zoom tubes will surpass them in the near future (See TR-24 from Trijicon)
Still, it's not a hardware question. To make consistent hits past 300m it's going to take an acceptable grasp of the physics behind it, practice with wind; luckily this can be learned in a short time.
Last edited by TehLlama; 04-11-10 at 22:57.
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