The reissues are re-casted from the G2 mould, but it doesn't affect the overall look or aesthetic of the toy. It's not like say reissue Jazz who was casted from the G2 Jazz mould which has that "sh!t-eating grin." :/ Reissue Primes don't suffer from that at all. Not having a mouth helps.

Btw I saw a pic of the upcoming Universe reissue Optimus Prime from Hasbro and the toy had full sized smoke stacks! It could just be the prototype mind you - after all, their last reissue had promotional images with full sized stacks and the toy itself had them shortened. And the missiles on the trailer could still be oversized or if it's normal sized then the launchers must be disabled. Unless Hasbro's finally decided to follow Takara's suit and market G1 reissues at adults thus exempting them from child safety laws!! But I wouldn't hold my breath.

I recommend getting an Encore Convoy.