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Trijicon ACOGÂ |
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Jeffr888
Optics GrassHopper Joined: July/20/2019 Location: Texas Status: Offline Points: 2 |
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Posted: July/20/2019 at 21:11 |
Trijicon ACOG 4 x 32 Scope USMC Rifle Combat Optic for A4
Will this be ok to put on my AR platform 7.62x39 ?
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Kickboxer
MODERATOR Moderator Joined: February/13/2008 Status: Offline Points: 23679 |
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The BDC on the ACOG is "designed" for a particular rifle... in the case you listed, Trijicon ACOG 4 x 32 Scope USMC Rifle Combat Optic for A4, the Marine Corps 20 inch barreled A4. However, you can "do the math", do the testing, and get holdovers for the 7.62x39 (or other). It is a fine sight, durable and fairly easy to use. I like it a lot.
The amount of effort you put into ballistics calculation and testing will determine how well it will work for you.
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koshkin
MODERATOR Dark Lord of Optics Joined: June/15/2004 Location: United States Status: Offline Points: 13182 |
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Trijicon makes a version of the 4x32 with a reticle holdovers designed for 300 Blackout. That reticle matches 7.62x39 ballistics reasonably well, so it will work fine for your application.
ILya
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Rancid Coolaid
MODERATOR Joined: January/19/2005 Location: United States Status: Offline Points: 9318 |
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ACOG is 20+ year old tech, but is a great medium-range optic, simple, durable, and clear.
For simplicity, it is excellent; but there are variables that work well for less money, and they do more things well. For the question, as asked: yes.
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Urimaginaryfrnd
MODERATOR Resident Redneck Joined: June/20/2005 Location: Iowa Status: Offline Points: 14964 |
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https://www.jbmballistics.com/cgi-bin/jbmtraj-5.1.cgi this is a link to a ballistic calculator link to Trijicon any time you have an optic with a ballistic reticle the lines below center will correspond to some specific distance no matter what cartridge you shoot. Some bullets are faster than others therefore trajectory varies by bullet and by caliber. If you have access to a range or location where you can shoot from 200 yds to 600 yds the way to find out is take a very large piece of cardboard or paper have the rifle zeroed at your choice of distance say 200 yds then take the rifle back to 300 aim at the center of the target shoot three drop back to 400 aim at center shoot 3 drop back to 500 aim at center shoot 3 drop back at 600 shoot 3. Go up take a can of spray paint and mark where those groups are on the paper and now you have where the bullet actually impacts at those known distances go back to those known distances and compare where they impact to the lines on the scope reticle to determine what they represent at each distance. Keep Notes or tape a note on the rifle. With a fixed power scope like ACOG this works great with variable power scopes one needs to know if they are second focal plane (reticle always looks the same at all powers) or first focal plane (reticle appears smaller at low powers and appears larger at higher power). With second focal plane scopes the ballistic reticle lines below center will represent a different distance at each power and typically are used at highest power. With first focal plane scope lines below center always represent the same thing these are usually tactical type scopes. This is why a guy with a 3-9 hunting scope with a ballistic reticle that works great at 9x for hold over winds up dialing down to say 6x in lower light then shoots over the top of the deer at distances farther than the zero distance.
Edited by Urimaginaryfrnd - July/21/2019 at 19:24 |
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MikieG
Optics Apprentice Joined: December/10/2014 Location: Oklahoma Status: Offline Points: 187 |
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Well said sir!
Seems like after shooting your exercise, a shooter could move to or from the target until the group landed on a stadia line, shoot a conformation group, and if all is well, laser that exact distance and wahala. You now have exact distance your round/rifle/zero combo produces hits at that stadia line. Does this sound reasonable?
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