I didn't see a thread for this so I'm starting one.

RK has the BTS-03 Prime upgrade set available. Fits your vintage or reissue G1 Prime with new hands that can open, a matrix for them to hold, a cradle for the matrix to sit in, an energon axe and a jetpack to hold his fists and axe.

I received mine the other day and I can say it really does make the figure so much ... more. It's hard to say, I love the G1 prime design to begin but this made it feel almost like a brand new toy. The matrix cradle fits great and needn't be removed for transformation and shows off the matrix to full effect in robot mode.

The only thing that brought it down a bit for me was that I got two right fists. Be really careful with the hands (especially the first time) as the thumbs feel flimsy to the touch.

I need to get at least two more now, one set for my original and one set spare