Big time performance boost from the D vs. Q
it would be one thing if we had the D-2 but our D-1 was a weaker of the D's so..yeah.
Also AW, the .50 cals weigh as does the ammo, so you will weigh more over all with the x4 .50cal package.
Same with the D model, take the 20mm for a wee bit less weight.