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Posted: 10/8/2003 6:15:45 PM EDT
I just bought this sight

www.dpmsinc.com/10Expand.asp?ProductCode=FT-RS

It says it has 600 meters of elevation. Does this mean it is meant to be used on a 16" barrel and won't be correct for a 20"?

Also will this co-witness with an eotech?
Link Posted: 10/10/2003 2:49:45 AM EDT
Link Posted: 10/10/2003 4:00:56 PM EDT
On a side note, if you used an 8/3 sight with a 16" bbl for example, what would happen? Would it not adjust your rounds correctly? Thanks
Link Posted: 10/10/2003 6:35:14 PM EDT
[Last Edit: 10/10/2003 6:47:45 PM EDT by Onslaught]
The difference between a 6/3 and an 8/3 sight is the MOA... The 6/3 is 1/2 MOA per click, the 8/3 is 1 MOA per click. The reason it's a 6/3 is that the finer threads take up more "post" and there's not enough room in a detachable carry handle for the extra length of post that the finer threads would need to still reach 800 meters of elevation. According to LTC Chuck Santose, the shorter sight radius of the 16" barrel makes up for the shorter barrel and as a result, the performance is roughly the same. In other words, since the front sight is closer to the rear sight on the 16" barrel, each click of elevation on the rear raises the muzzle more than it does on a 20". That has been my experience with the DPMS and a 14.5" bbl, as well as the RRA Tactical handle and a 16" bbl. BTW, the DPMS sight is an 8/3 sight wheel, but will only turn to the 6, which is why they call it a 600 meter sight. I suggest reading [url=http://groups.msn.com/TheMarylandAR15ShootersSite/improvedbattlesightzero.msnw] this[/url]to learn more about zeroing your sight.
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