Are the Trijicon A.C.O.G's parallax free?  I'm concerned about getting (or rather not being able to get) the perfect eye relief with the TA11 or TA31.

For example, with the TA11's 2.4'' of eye relief, can I be anywhere from 2.4'' and in, or does it have to be exactly 2.4''?

For those who have used the TA31/TA01.  Is that super short eye relief an issue?  It seems like it would be hard to maintain proper eye relief when moving into and out of different shooting positions.

Thanks for any input.

Quoted: Are the Trijicon A.C.O.G's parallax free?  I'm concerned about getting (or rather not being able to get) the perfect eye relief with the TA11 or TA31. They are parallax free along the vertical axis.  The ranges the BDC is calibrated at are correct for those ranges.  This has to do with how the reticle and prism are set up.  You still must maintain good head position.  It is a scope after all and all scopes require a consistant cheekweld. For example, with the TA11's 2.4'' of eye relief, can I be anywhere from 2.4'' and in, or does it have to be exactly 2.4''? That is the optimal eye relief.  Like any scope it can be closer or further by a bit but not much. For those who have used the TA31/TA01.  Is that super short eye relief an issue?  It seems like it would be hard to maintain proper eye relief when moving into and out of different shooting positions. Not a big deal, however the TA31 hits my shooting glasses sometimes which is annoying. Thanks for any input.