How bad did I just mess up? RCO-A4 on 16"

[jhova98040]

Hello all,

I just may have made a big mistake... Got an excellent (I mean almost irresistible) deal on a RCO-A4 in a LaRue mount.

Was so blinded by the price that I didn't think things through until I looked at it and realized it was an A4 model. I saw the ACOG (in M4) that I wanted and just bought without thinking.

Now the question is how badly did I mess up? I only have carbines (16" and 14.5")...

Anyone know when the BCM 20" uppers are coming out :D?

[Saginaw79]

Is it a TA31RCO, or a TA31RCO-M4? Ive never heard of one called an A4

Either way you will be OK, but your BDC lines may be a little off if its the RCO and not the RCO-M4, just zero it as normal and you'll still be on at that distance

[jhova98040]

It is this model:

http://www.trijicon-inc.com/User/parts/products1.cfm?PartID=476&back_row=4&categoryID=3

[Saginaw79]

I guess they did rename it some.

I think you'll be OK, but the lines w/ be just a bit off IIRC

Somehwere there is a chart on how to zero 'wrong' ACOGs on certain rifles and theres only an inch or 2 difference out to 3 hundred yards

[Ttwwaack]

Your all right. There is/isn't all that much difference. Zombies are pretty tall so you should be alright out to 4-600. After that if the wind is blowing it's kinda a religious zen thing.

[jhova98040]

Called Trijicon... They told me POI change would be way off past 200 yards...

[LettersFromEarth]

Called Trijicon... They told me POI change would be way off past 200 yards...

ONLY one way to find out...;)

[jhova98040]

sadly my range only goes out to 100 yds... this was going to be my SHTF optic. sigh.

[Patrick Aherne]

Take it out and shoot it at long range. That's the only way to know where it hits with the load you are shooting.

[JHC]

Don't despair!!! My TA01 (red crosshair) would have been designed for a 20" correct? Carry handle mount me thinks.
Well on my 16" flat top I've hit like the dickens with it at 300 and consistently on a 8.5x11" paper at 600 (Lake City m193). That's more than I can use.

[LettersFromEarth]

Go and shoot it and get a real good BZO at 100m. I'll dig some numbers up relating to drop at distance/brl length/ammo type. I dont think it will be as "way off" as you might fear.

[jhova98040]

cool. will do.

[LettersFromEarth]

Look on TOS (AR15.com) and you will find a BIG BAD ACOG thread thats tacked up near the top/center of the page. The information you seek will be found there.;)