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Power cylinders for the new Rogue One blasters used by the Deathtrooper, Shoretrooper and Stormtrooper.
The size of the countersink will accept standard DIN 7991 M3 socket cap screws.
The size is scaled to be as close as I could get for the sterling based blasters that where all we had when the film was first announced. Since then its become apparent that the S&T BB gun based blasters that the film uses are a little bit larger. Depending on you're base gun these will either be about right (Sterling SMG base) or a bit under size (S&T BB gun base).