I personally think a lot of people put to much stock in "original mil spec" parts. Just because a particular part was not made by an original military contractor during the active production of the weapon does not mean it is not a quality part. Metallurgy, machining techniques, heat treating, etc. are always improving, and any modern made part of quality manufacture should serve just as well as any original mil spec part.
My recent production M1-A shown below has about 1200 rounds thru it, everything from dirty 3rd world NATO stuff to carefully crafted handloads, and it has proven 100% reliable, (not counting bad magazines) grouping right at 1 inch with loads it likes. A note about magazines, if you decide to get one- Stay away from the cheap metal and plastic magazines you see - I have tried quite a few, and they always seem to fail in one way or another. Stick with the mags made by Check Mate Industries, they are an official military contractor, and are the manufacturer of the magazines Springfield sells with its M1-A's. Difference is you can buy them directly from Check Mate for about half the price Springfield charges.
Not sure about the Socom muzzle brakes, but I would assume so provided they are not welded on.
Larry