PTR-91 CCO and POA/POI Question


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SSG Scott
January 25, 2014, 01:34 PM
I own an AR-15 with an Aimpoint CompM3 and have recently purchased an EoTech XPS2 with the intention of putting the XPS2 on my PTR-91. I understand that an ACOG would have undoubtedly been the best choice for the PTR-91, but it wasn't in my budget and won't be for a while (Unless someone reading this thread if feeling charitable and has an ACOG with the .308 ballistic reticle they are willing to give away :) ).

The Aimpoint on the AR-15 is good for engagements from Close Quarters out to 300 meters when using M885 Ball and zeroed at 25 meters, so I theorize that a CCO on the PTR-91 should be just as effective between those ranges, if not better. I primarily shoot 149 Grain FMJ, and my PTR-91 has an 18 inch barrel and 1:12 twist I believe.

That being said, here is what I am looking for opinions on:

1. EoTech or Aimpoint on the PTR-91 and why?

2. With the PTR-91 and CCO, if my POI is 2 to 2.5 inches below my POA at 25 meters, at what range(s) will my POA/POI be the same?

Thanks!

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HKGuns
January 25, 2014, 04:25 PM
Get a scope for the .308...They are not CQB rifles.

Girodin
January 25, 2014, 06:53 PM
If I had an aimpoint and an eotech and one was going on an AR and the other on PTR I'd put the aimpoint on the PTR. The problem with Eotechs on most things other than ARs is that they just sit too dang high. With aimpoints you can change the mount and make it work much better on none AR guns.

They only thing that might change my mind would be if I very rarely shot the PTR and the AR was more of my go to because I tend to prefer aimpoints to eotechs. Barring some consideration like that, however, the aimpoint is a MUCH better match for the PTR IMHO.

Girodin
January 25, 2014, 06:55 PM
As to your POA/POI question. If you know your velocity, the BC, and other variables run the numbers through a ballistic calculator to get a idea. Its also recommended to simply shoot the gun to confirm the math.

SSG Scott
January 25, 2014, 06:57 PM
@ HKGUNS: If you are in a gun battle, you can just run to a weapons crate like you are playing battlefield 4 and swap out weapons. We can't pick and choose if our gun battle occurs at extended ranges or finds us in a building.

I believe the HK-G3 is still used by many countries around the globe as a main battle rifle, and I am pretty sure that includes CQB work, as I doubt a truck pulls up and allows the soldiers of these countries to swap out their weapons prior to clearing a building.

The SCAR 17S is a .308 and can be used for CQB. The Springfield Armory Scout Squad and SOCOM 16 are .308's that are capable of CQB work. Any semi auto .308 can be used for CQB with the proper optic.

Mission will often dictate the weapon that is carried, but Murphy's Law dictates everything else. So if the mission dictates a .308 Battle Rifle, it should be set up to handle more than just long range engagements. That is just common sense and reality.

The idea is to have a .308 with a suitable optic to engage dynamic threats from Zero to 300+ meters, giving the shooter more punch than he would have with a 5.56. So I must reject your idea that a .308 can't fill a short to medium range role.

SSG Scott
January 25, 2014, 07:21 PM
@GIRODIN: That is the info I am looking for. Both the EoTech and the Aimpoint sit a little high, I have a military issue M68 mount on my Aimpoint that I brought home from deployment, and I can change that out. I have a low profile mount on my PTR, so that helps keep the EoTech low. I created a temporary cheek riser with some black duct tape and 3/4 inch pipe insulation. It did the trick, but it looks a little awkward, so I am considering a snap in cheek piece, or spending a little money down the road on a Magpul PRS Tactical Stock.

Both of these weapons are SHTF weapons. The one I use will depend on the tactical situation. I live in Alaska. I can hunt a moose or caribou with a .308 AND us it to defend against bad guys if a close quarters gun battle occurs.

I often see moose and caribou at close to medium range, but a scoped .308 is not good if bad guys catch you at close range.

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