I am considering buying either a TA31 or a TA11 for shooting 3Gun, and my question is: for each of these, how far forward of the charging handle (rear end of flat-top) must the rear lens be positioned for proper eye relief?
I normally shoot "nose to charging handle". Before considering the ACOG, I was using a Leupold 1.5-5X which has between 3.7" (at 5x) and 5.3" (at 1.5x). To get enough eye relief with this scope with my nose to charging handle, I had to mount the rear lens of the scope about 2" in front of the charging handle, which necessitated the use of a Super-Extended ARMS rail (#36S-EX, I think).
Based on the rough approximation that in nose-to-chg-handle, my eye is about 1.5" to the rear of the chg handle, I would guess the TA31 should be mounted even with the rear, and the TA11 should be mounted between 0.5 - 0.9" forward of the rail.
Does this sound about right? With the rear lens of the TA11 mounted 1" forward of the rear, will the rail mount (TA51?) go too far forward past the front end of the flat-top rail?
As a side question, is a TA31 or a TA11 better for 3Gun? I would guess that the TA11 would be better for close shots...
thanks
Zak