Either one will work for you. The Socom uses the same gas system as the full sized rifles, but has a larger gas port in the bbl to offset the potential for short stroking. The odds of actually wearing out a gas cylinder are just about nil.
A Squad Scout with either a SEI Vortex or CG Muzzle Break is pretty short (about 1.5" longer than a Soc).
The Socom break works great, but SEI makes muzzle devise for the Socom now as well.
If you want short, try a Soc.
Then, buy a couple of spare USGI extractors with springs and plungers, and a spare USGI hammer. SEI has the best trigger group pins made, so get a set of those, too, and you will be set.
The Soc will use the 110 TAP with no problem, so you should be GTG with a load of your own, however, Varget is not recommended in M14's. Glen Zediker has written some interesting info on reloading for M14's.
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