G-1 Megatron, Version 2.

So much better than my last attempt...and now he looks like an unbridled raging war machine, at least in robot mode.

With rifle accessories this time.

War-torn Cybertron.  Anyway, the rifle stock combines with his legs to make them thicker, while the gun barrel and rifle barrel perch on his shoulders as separate weapons in robot mode.  Not to mention the rocket packs built into his arms.