A lot of fans were really excited about the prospect of a "Masterpiece" Megatron toy to correspond to the "Masterpiece Optimus Prime" of a few years ago. More specifically, they were thrilled that there would be a Megatron "in scale" to Prime (at least in terms of robot mode). Now, I've already commented on the ultimate futility of "scale" arguments, but the reality is that this makes a big difference to a lot of fans.
But let's face it, how many adult fans (those most likely to be able to afford these particular toys) are actually likely to physically engage their robots in battle? After paying all that money to import the toy from Japan (which will never be made available domestically, because of the realistic, if admittedly oversized, gun mode. This gun mode is a reason I will never have this toy in my home, either. I'm not a fan of realistic guns.), owners of Masterpiece Megatron would never risk chipping the paint or denting the plastic (even assuming they don't have the childish impulses they once almost certainly had when the Transformers started out in the '80s)!
But, fear not, Transformers fan! For I have discovered the real scale to which Masterpiece Megatron was constructed, thanks to a picture from my brother (who doesn't have the hang-ups I do about this toy). This picture clearly shows that Megatron was intended not for battles with the demonstrably heftier Masterpiece Prime, but for display with the original G1 Laserbeak toy, which was often traditionally shown in precisely this position atop Megatron's arm. Here they are, together again as they were always meant to be!