Using ACOG for 20" A4 on M4

[ptmccain]

Guys, a buddy of mine has an ACOG he is selling and it is this one:

TA31RCO for the M16A4 Weapon system (20” barrel).

Question, forgive my ignorance, but...

If I use it on my M4 Carbine and/or my FS2000 (which has a 17.25") barrel what do I need to be aware of?

In other words, what make it "custom" for a 20" barrel and what happens if I use it on a 5.56 platform with a shorter barrel?

Thanks.

[cop1211]

You can use it, the BDC will be off by a little if you plan on using for longer range shooting .

You would just have to find your hold overs through trial and error.

[ptmccain]

Would you anticipate any "hold over" issues from 25-100 yards?

[cop1211]

No once you zero it those distances should be fine.

Zeroing per the manual is 100 meters comes out to I believe 109 yards.

Like with an rds you will have to take into account height over bore when getting in cqb distance.

I zero mine at 50 yards due to me not having access to a range over 200 yards.

Once zeroed at 50 it was good to go at 200 just put the poa about an inch lower.

[ptmccain]

Thank you sir.

[cop1211]

No problem hopefully you'll get more replies to your questions.

[Iraqgunz]

With alot of practice you can get good at shooting it at close range, but I felt like I was at a distinct disadvantage when I used it in the Magpul course. After 50 yards it was better and at 100 I was the one with the advantage.

If you don't plan on shooting over 100 yards most of the time I would stick with a red dot scope which is probably significantly cheaper.

[Alaskapopo]

With alot of practice you can get good at shooting it at close range, but I felt like I was at a distinct disadvantage when I used it in the Magpul course. After 50 yards it was better and at 100 I was the one with the advantage.

If you don't plan on shooting over 100 yards most of the time I would stick with a red dot scope which is probably significantly cheaper.

Or get a good low power variable or get an off set mount for a micro red dot to use with the ACOG.
I personally don't like being stuck with just a red dot or just an ACOG.
Pat

[Iraqgunz]

I was only addressing the ACOG aspect. There are a million things you can do if money isn't an object.

Or get a good low power variable or get an off set mount for a micro red dot to use with the ACOG.
I personally don't like being stuck with just a red dot or just an ACOG.
Pat