I know the OP wasn't heading this direction, but I thought I might through this out for anyone else considering red dots.
I've been messing around with my SOCOM for quite some time now and I think I've tried just about everything in the way of sighting systems. I originally set it up like this:
Just my experience and a FYI for anyone considering a $700 dot sight:
I just couldn't bear to obscure those magnificent M14 irons. I don't have stellar vision anymore but I consistently surprise myself with the M14 irons out to distances that I can barely see targets. I used a NM front and SOCOM aperture and It worked great at the range but turned out to be terrible in low light conditions at distance. You can see the dot but the optics darken the already darkened image making acquisition of a hard to see target in a low light environment even more difficult. The aperture sight makes it even worse. I love M14 sights but they do darken everything just as a camera aperture would.
I ended up leaving the Ultimak rail, selling the MI mount (that used to mount my PEQ) and just using iron's during the day and clipping the PEQ on the Ultimak at night.
So if it's only short range you're after I think your heading down the right track. Just don't sell short the SOCOM at distance. You've got different come-ups but should be able to hit a 12" steel at 300yrds I would think (mine does after ejecting the defective guide rod and bolt). I know people have had issues, but the 16" barrel shouldn't be a hindrance at 4-600 yrds if you know your come-ups.