Rifle Scopes ACOG

[Collier7906]

I am Currently deployed, I was issued a ACOG for my M4 but was never given a chance to zero it. Due to the area I operate in I would rather use my acog than my M68 CCO. I just recently found out after 7 months in country that we have laser bore sighters. So my question is does anyone know about how accurate it would be with a 25 meter bore sight ? We can't go to the range and zero it due to ammo constraints. So it is basically a $1,300 paper weight. Any advise would help.

Thanks,

Collier

 

[JHenckel]

Re: ACOG

well it aint going to be dead on, but it cant hurt right? if nothing else leave it on for the magnification.

 

[Redmanss]

Re: ACOG

Really it depends on the bore sight and how well you apply the equipment. I've seen some bore sights that were horrible and others that were inside 1moa. If you can, run your bore sight at 100m or at least as close to it you can. Do it in the evening if you're having a hard time shooting the laser that far in the daylight.

If you bore sight it with the laser, pull your bolt and do a backwoods bore sight as a backup check to the equipment just in case it's really out of whack. Look down your barrel and line it up on something in the distance, then check to see if your aiming point is also on it or at least close.

Finally, I don't know what kind of ammo constraints you're under where you're at, but I haven't run across any kind of ammo shortages for a zeroing exercise. Someone out there should be able to hook you up with 10-20 rounds if you ask. Hell, I will if you're in my neighborhood. PM me if you're in the capital area.

<span style="color: #FF0000">ETA: Don't stake your life on a sight that isn't zeroed properly with live fire. I was answering the question of "how accurate is a laser bore sight" when I should have been answering the unasked question of "is this smart to do where I'm at".</span>

 

[GreatGonzo]

Re: ACOG

Find a fixed object 200-300 yards away. Pull your bolt and find something to stabilize the upper. Line your bore up with the object, then match the scope with the bore. You can get very close this way. I am almost always within a few inches at 100 yards with this method. You shouldn't need more than 3 or four rounds to get a pretty good zero after that.

 

[sgtbutt]

Re: ACOG

If I remember correctly when I bore sighted my PLTs ACOGs, CCOs and PEQ15s there is a process to it. First off find a spot 25 meters away. THen what you do is you'll have to calibrate your bore sight by shoving it in your barrel and adjusting the windage and elevation knobs on the laser unit so that when you rotate it within your bore the laser dot stays in one spot. At least this was the model that I used straight from Ft Hood's MOB Assitance BGe or whoever they were.
Once your bore sight is calibrated, and you have your 25 meter back drop adjust your ACOG so that the top of the vertical post is on the dot at 25. Not the tip of your Cheveron (provided you have the Red Chevron reticle), but the tip of the post. The tip of the post is supposed to be the 25m zero point and that makes the Chevron tip 100m, and all the other drops should work.
This should work out for you.

 

[1stIDvet]

Re: ACOG

Im sorry but how the hell were you deployed without being able to zero your weapon?? Did you zero the Iron sights and then they issued you the ACOG just before wheels up? Also, is there a range near you in whatever country your in that will allow a 25m zero? You could bore sight it, but if your going to have to use that ACOG, I highly recommend you properly zero that sight.

 

[Redmanss]

Re: ACOG

Maybe I'm understanding him wrong, but I think he's saying he has both a M68 and an ACOG, and the 68 is currently on his rifle and is zeroed. He just wants to switch to his ACOG.

I definitely agree though, zero in the sight properly or don't do it. Bore sights are for getting on paper without wasting ammo, not for counting on to be accurate in a hot AO. I'm editing above to reflect that too.

Again if the issue is ammo, I'm sure you can come up with that. You're just not asking the right person yet.

 

[1stIDvet]

Re: ACOG

"Maybe I'm understanding him wrong, but I think he's saying he has both a M68 and an ACOG, and the 68 is currently on his rifle and is zeroed. He just wants to switch to his ACOG." -Redmanss

Your probably right, I hope you get this squared away OP. Stay safe out there guys.

 

[chittnp]

Re: ACOG

Someone correct me if Im wrong, but I thought that if the acog was zeroed at 25 yards, the same POI would occur at 250. If you google the army's pub on it it should explain it. The last time we went to the range we zeroed at 25 m using the top of the red bar under the chevron as the POA, then shot the normal pop-up range out to 300m, using the top point on the chevron as the POA. (I'm not sure that POA is the right term here, but its the part of the reticule we used to aim with.) I may be way off here, but I was under the impression this works because the BDC and reticule are designed for 5.56. At any rate, a 25 meter zero should get you hits at 300M.

 

[SmokeRolls]

Re: ACOG

First off, find ammo to zero....This is critical and you aren't making enough noise to the right people. Once you have ammo then proceed to installing acog. Set acog for correct eye relief (shoulder the weapon with eyes closed and then open to see if acog is as close to perfect distance WITHOUT you having to adjust your head closer to sight.)
Lock the sight down once correct eye relief has been found.

Lazer bore-sighter is good but use this method to verify;
As mentioned before in previous post you can take your upper off and bolt out and find something that will secure the weapon VERY well and have it facing something you can designate as a target at 100 yards or 100 full stride paces. Securing the upper with sand bags will do well just make sure that you can see out of your optic and then eyeball a target thru your barrel and fix your barrel on that target... Once that is done then adjust your acog to match up to said target. Go back and forth between barrel and optic to make sure barrel is still on target after adjusting. Once they both line up on target then you will be closer to success.
Get a spotter to help you speed up the process and verify hits.
Your rifle's accuracy and your confidence in it is paramount.
Hope this helps. Be careful and be safe.
....SmokeRolls

 

[marshallwk]

Re: ACOG

Which model m4 is it(full auto or no). The army fm on rifle marksmanship (fm3-22.9) has instructions on how to boresight your rifle. If you do it correctly with the correct offset it will be close.

That being said I would not trust my life just boresighting the rifle and using offset targets. Theres no way you can shoot three rounds at least and confirm your zero?

If you need the FM and dont want to download the whole thing PM me and ill hook you up.

 

[KNIGHT11B4]

Re: ACOG

Not to put a bad spin on this...but..

Your deployed, have been for some time... How long have you been without a zero? Why are you on a forum instead of talking to your NCOs and addressing this problem?

Im an quite sure that there is an NCO that you can talk to to get the info that you need, does your Team Leader know about this problem?

Posts like these have more than a few things wrong with them.

 

[samnev]

Re: ACOG

One thing I do when changing scopes is to put my rifle in a my padded adjustable vise, sight on an object about 100 yards away take the old scope off. Then install new scope making sure vise hasn't moved and install new scope and adjust to old scope POI. That usually get me within a few moa @ 100yards. However final zero is still required. Usually can finalize zero within 5 shots. This will vary if there is a difference in height above bore.