I have a 1.5x16, 4x32 and 5.5x50 on other weapons, and like them all.  I am curious which optic you all would recommend for my PS90, with a few caveats:

1.  I intend to order a new one, and not cannabalize off one of my other rifles.

2.  I am currently deployed and issued an M4 with M203A1, but only with the M68 CCO on it (which I do not care for at all).  I intend to put my new ACOG on my rifle and then transfer it when I get back.

3.  I am leaning towards a 2x20- compact and useful for CQB but still with some magnification for engaging at range better than the CCO.  It has 2.1 inches of eye relief, as opposed to 2.4 for the smaller 1.5x models I see on a lot of PS90s.  But the 1.5x24 has over 3 inches, which sounds good for the PS90 but lower on the magnification than I prefer for use now.  The new 3.5x35 has the 2.4 inches of eye relief, but would that be large and overwhelming on the PS90?

Any recommendations from the hive mind?

More eye relief the better, I think the 2x would be the best choice

personally I like the white ring sight