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Posted: 7/30/2008 12:09:27 PM EDT
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I know that the TA31F-RCOA4 is made for 20" barrel, and RCOM4 is made for 14.5" barrel. Is the normal TA31F made for in between that? Thanks |
Your right, it would be hard to tell the difference between any of them for most shooters. |
Just curious. What does that translate to in inches at 100, 200, 300, etc yards? |
Spot on. - by my calculations you'd have to be shooting within 1MOA at known distances - in which case it's still a pretty arguable point on application - you just don't put an ACOG on one of those, need a target style optic with adjustable knobs for that kind of accuracy. For shooting at unknown distance, it is extraordinarily difficult to notice the difference between the 20" and 14.5" RCO's (I sure can't), and you won't notice the difference shooting. Cheers |
www.ar15.com/forums/topic.html?b=3&f=18&t=229420 62gr. 5.56mm Flattop BDC ACOGS that use this BDC are the: TA01NSN, TA31F, TA11F, TA11F-A This BDC is based on a 14.5" barrel firing M855 with the ACOG mounted to the receiver via a TA51 mount. If you have one of these, sight in according to manual. Stats used to figure BDC baseline: M855 traveling at 2,970fps with a BC of .304 and a height over bore of 2.5" For a Flattop 20" firing M193: Sight in per your manual. You'll be within MOA of your BDC. For a Flattop 16" firing M193: Sight in at 100 per your manual. You'll be a half-inch high at 300, dead on at all other ranges until 500. At 500, the M193 starts losing juice fast on this trajectory, you'll be 2" low at 500 and 9" low by 600. For a Flattop 14.5" firing M193: Sight in at 100 per your manual. You'll be a half inch low at 300, 3" low at 400, 9" low at 500 and 15" low by 550. Once again, the 55gr loses gas fast past 300, so there isn't much you can do here without making your near zero absurdly high. |
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The BDC of an ACOG is not for precision shooting, it is made to get you hits on a 18” x 20 “ target at midrange distance 300 to 600yds out. The TA31F’s are setup for a 14.5 to 16” barrel as it have been established, but if you are only shooting out to 400yds you can use any of the ACOGS. The altitude, bullet weight, and the quality of the barrel will play a big part of the BDC accuracy. In short you will be Several INCHES off. Mike @ CSGW www.csgunworks.com [email protected] Here’s some testimonials about CS GunWorks FEEDBACK about CSGUNWORKS on AR15.com FEEDBACK about CSGUNWORKS on Snipersparadise FEEDBACK about CSGUNWORKS on the HIDE |
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