I disagree. I rarely if ever transform Megatron because he is too flimsy and fiddly. I agree with the additions and sizes, etc.

Look at G1 Prime though. Fast, fun transformation, despite being very simple and requiring add-on fists. I transformed him back and forth for ages as a kid! Megatron, on the other hand, spent a lot of time on the shelf.

Browning is better proportioned than Megatron and can shoot a simple "bullet" or fist, rather than the bullet system Megatron had. And his arm, minus fist, is a gun, like Shockwave. Megatron's sight becoming his weapon never worked for me. He also has a less pronounced.... um... codpiece...