mags yes, grip yes, rails no
Most mags are the same, Pmags, troy battlemags, PDW mags, etc fit just about any M4.
There are a few M4s that take a slightly proprietary mag, but stick to G&P, VFC, G&G, CA, marui, mainstream brands and you'll be fine.
The different mags are just looks, Pmags, stanag mags and troy mags are the same thing just look different
Generally all M4 mags work in M4s, with the except of PTW mags and gas mags. Just look up reviews for what brand of mags work the best.
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