I have been searching for a way to mount an optic to my SA M5 (no side rail). I am open to these optics: T1, M2, or RMR Below are some of the mounts that have caught my attention. The Ultimak works but I would like to get the optic a little bit closer to the rear of the rifle.

I like the Attero Arms mount because it is so simple. The MI mount is very close to the Attero but the MI has a few more screws which is a bit of a turn off.

The TWS rail looks solid and it would allow me to run a M2/M3 in a low mount. A plus is the rear sight gives you a much longer sight radius than the factory rear sight.

I have not read any real feedback on the Parabellum top rail that AIM has been selling but it looks about the same as the TWS.

Right now I am leaning towards the Attero mount with an H1.

Thoughts?