I'm not familiar with the 901 and its recoil, but I tried my TA01NSN on my FAL once and the 1.5'' eye relief was an issue for me...
do the same and try it on your 901 before spending big money on another TA01, as already said maybe a TA11 can serve you better.
Originally Posted By 223spree: Den40 which TA11 is on your 901?
It is the TA11J, which is the cross hair model. I found it to be a little easier to obtain smaller groupings with it than the Chevron model on my TA33. I have only shot it as far as 200 yards with it, but it provided great visibility. The eye relief is also greater than my TA33.