Actually, Im looking for an alternative to the Wilson. I have a RRA Midlength upper. It does not have an F marked FSB. Initially I went with an Arms 40. I had to use the bushmaster tall front site to get it on paper. I switched to the Wilson BUIS and dialed down the rear sight a bit. All was well.
I just switched to a Larue Eotech Mount/ 552 in front of the Wilson. The rear sight hangs over the flat top. Not quite enough room to get the Wilson to but up against the Larue mount.
Changing the FSB would solve the problem, but that is a bit of a pain in the ass. I would like to use a rear BUIS either fixed or folding that has an elevation adjustment. I need one that takes up as little space as possible. The LMT and DPMS do not look like they will fit.
Any suggestions????