My kitbashing experience is almost nonexistant, but I'm happy with this. I've always liked this Megatron figure, but I always thought that he needed an arm cannon, especially when I discovered that this Megatron was originally supposed to be G1/G2 Megatron reborn, and I've been wanting to do this for a very long time. And so I finally did. I borrowed a Dremel, and I found the (almost) right sized bit, and I carefully drilled a hole into Megatrons right arm, below the elbow socket. I also had to file down the guns handle a bit bc it was too long. I did drill the hole a little too big, so I fixed the problem by applying some gorilla glue around the rim of the new peg hole, to close the gap a little, and it worked. The gun can peg into the arm, and be removed without any issue. Now my beast Megatron has an arm cannon, and I'm pretty happy with that. EDIT: 07-16-14 I'm posting this here instead of starting a new thread, bc it's pretty much the same concept. I took a larger drill bit and did the same to AOE Galvatron. Now he's got a decent arm cannon.