I love the way it looks, and I love the way it folds... However I have to agree with Lava that it is just not the best idea to use it as the base platform for all guns... Not from the realism point of view since we can throw it out and just use the rule of cool here but from the uncanny feeling of attaching something to the blaster to make it fire PROJECTILES? SHOTGUN SHELLS? Blaster as the main energy emitter for all guns with, let's say, add-ons to make it into a luci, md, or lasgun or pulse rifle is one thing but to make it into a chaingun or a ckit? It's just not fitting for me... However if you drop the add-on thing and forget about what you saw in SW:Republic Commando then you can think Mass Effect and go for every weapon to be foldable, to make it into a compact form for the armoury...
By the way: the armoury could be some equipment teleport not just a big locker...
ed.: If you really want to keep something common in all guns, like maybe this is where the add-on idea was originally coming from, you can make the trigger and fire control mechanisms common in all guns and the barrel and ammo packs differ in all of them with this trigger part folding into them when you put it away...