So, I'm working out the GD-x list rifle-wise, and I got wondering. GDI's used the M16 (C&C) and Cobretti Raptor (Renegade) during TW1, and according to the GD-3 dev entry standardized on the Raptor. These appear to both be 5.56mm guns. By 2030 we have the M16 Mk II, which is a .22 caliber pulse rifle (basically same size round as before, but not metric). By TW3, there's the GD-2... which has no round information. Given that, cyborgs of TW2/Firestorm aside, Nod doesn't seem to have really invested in body armor, I'm guessing that the GD-2 is still 5.56 or .22 caliber (also the design of it in the unit icon for the rifleman looks a lot like the M41A pulse rifle prop also used in C&C2 that was designated "M16 Mk II" alongside a Ruger Mini-14 based prop).
My question is... does the GD-3 keep the 5.56/.22 round size, just adds a 20-25mm grenade launcher for anti-Gana capability, or does it do like the XM5 is doing and increase round size for better performance against "body armor"? The part about making new machine guns to match new rifle ammunition seems to point to a new round size. ... unless the GD-3 is more akin to the XM25 (the standalone 25mm grenade launcher from the OICW project), in which case the new rifle "round" the GD-M3 is built around is 20-25mm?
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As an aside, I realized recently why Gideon had to go. Kane's Stahl-ing for time.