[Duke of Lawnchair]

Alrighty folks,

There are a lot of ACOG-files on THR and that is why I'm here posting this thread.

I haven't been able to zero my ACOG on my 20" A2 profiled barrel & A4 flattop. My mount is an ARMS #19S.

All of my AR15s have been zeroed using the IBZ (50yd zero and dialed in @ 200yds).

Is it safe to assume that I could do the IBZ with the compact ACOG? Also, not to sound too much like a tool, but what does the vertical line underneath the reticule supposed to represent. The manual makes absolutely no mention of it.

ACOG model:
TA50-2 3x24

Thanks in advance,
Jim

[cheygriz]

I'm not familar with IBZ, but I have the same compact ACOG on a Bushmaster Dissapator, and I zeroed it at 200 yards the same way that I zero any other scope.

I put it one inch high at 25 yards. That took about 6 rounds.
It was about 2 1/2 inches low at 200. I "clicked" it up to be right on. Whole process took abpuit 20 minutes and about 12 rounds.

Ammo was Bosnian "Hotshot" 62 GR SS109. 62 GR Wolf shot to basicaly same point of impact.

[Duke of Lawnchair]

cheygriz,

Thanks for your input.

The IBZ (improved battlesight zero) makes use of the 5.56Nato's trajectory.
The point of impact at 50yds should be the same as that of 200yds.

Zeroing at 50yds will yield similiar results at 200yds.

I'm going to take your advice and zero the compact ACOG @ 200yds.

Have you figured out what the vertical line under the reticule is supposed to be?

Thank you,
Jim

[Bartholomew Roberts]

Jim, I would drop a line to Trijicon to clarify; but I believe the distance between the bottom of the triangle and the vertical line is a certain number of MOA and it is used for ranging. You might also check out the manual to see if it references it.

[cheygriz]

Jim,

Thanks for the explanation of IBZ. I served 1961-1965, so I'm not up on all of the new acronyms.

Can't help you on the vertical line. I think Bart's advice was good. My compact ACOG has the red crosshair, not the chevron.

BTW, I wouldn't trade my ACOG for anyhing else that you can possibly put on an AR-15. How do you like yours?

[DMK]

FYI: IBZ
http://groups.msn.com/TheMarylandAR15ShootersSite/improvedbattlesightzero.msnw

Some random info I found on the ACOG range markings:

http://www.productwizard.com/trac5redchba.html

http://articles.findarticles.com/p/articles/mi_m0BQY/is_3_49/ai_97170890

http://147.248.250.93/pao/Web_specials/Leadership_of_Futures/050804.htm

[Duke of Lawnchair]

Folks,

Thanks for the responses.

DMK, thanks for the ACOG info!

cheygriz, I haven't had a chance to zero my mousegun with the compact ACOG. I built an M16A4gery upper nine months ago and received the compact ACOG a little after that.

The TA50-6 had to go back to the factory due to a tritium leak. However, when it came back (05/17/04) the RMA invoice stated that the fiber housing was replaced.

It seems to be a handy little scope and I'm already used to the BAC (a lot of dry-firing and no range time will do that to ya').

A range trip is in order once I come back from Boston.

I'll let you know how I like it then.


Jim

[444]

I don't know a lot about ACOGs. I have one: the TA31F.
It specifies in the instructions that they tip of the chevron is supposed to be POA/POI at 100 yards. It has a vertical line under the chevron that is calibrated for 5.56 ammo for elevation out to 800 meters. If you don't zero with the tip of the chevron at 100 yards, then the whole concept of the scope is rendered useless.
It sounds like you have a crosshair reticle. I would research the subject so that you take full advantage of the features you paid so much money for. I am sure that you could call them and they will put you on the right track.

[Duke of Lawnchair]

444,

Back from Boston, whew.

I have the TA50-6 (compact ACOG with a big dot reticule).

The instruction manual makes absolutely no mention on zeroing.

I've been trying to research the subject, and everyone is saying something different. Trijicon won't even give me a straight answer.

Jim

[Duke of Lawnchair]

I finally zeroed my TA50-6 at 100yds.

The upper edge of the dot was used for my 100yd zero, with the bullseye tangent to that edge.

I'm diggin' this compact ACOG. The only thing that I would trade it for would be a compact ACOG with the red or amber triangle.

Jim

[Duke of Lawnchair]

BTW, Carrie at Trijicon answered my question about the vertical line beneath the reticule.

The vertical post beneath the illuminated reticle gives the operator a visual gauge for level.

Also, I think it's time that I seriously looked into a very crisp and clean single stage (I'm just not digging two stage triggers for "fast" shooting).
Perhaps a JP???

Jim