Ok, to the OP, you asked if this was a good thing (selling the BAR10 for a UTG mk96). You have gotten many responses, but it seems you made up your mind beforehand and you were just trying to reaffirm your own hopes about the gun.
The UTG MK96 is a pretty solid model, but if you do get it, make sure to do the free mods I listed back on the first page (and also please keep an open mind about upgrades and other model guns).
-One noticeable thing I like about the BAR10 over the MK96 is that the whole BAR10 will fit nicely into an inexpensive Dosko rifle case. The MK96 is so wide that I have to remove the bolt handle before I can close it.
On a slight tangent, the UTG mk96 does have some features that I like, which are not found on the BAR10 (I think, please correct me if I'm wrong).
1) cocking indicator (must be slightly modded to work, just replace the screw on the piston with a slightly longer one of same diameter)
2) Empty mag indicator (must be fixed, like all clone rifles, the spring is too long and is placed on the wrong side of the plate)
and my favorite:
3) The magazine feeding style, which does not have a free floating round between the mag and the chamber every time you lock the magazine into the gun. Plus, the magazines pop out into your hand very nicely when you disengage them. The feed style of the BAR10 magazine irritates the hell out of me cuz if you want to check your ammo you have to either lose a round or place it back in the mag whenever you release the mag.
4) also, you if disengage the spring guide stopper and remove the cheek rest you can pull the bolt and cylinder assembly out without having to remove the receiver. However, you can only do this with the stock trigger mech attached, and not with a Zero Trigger (the Z trigger's piston sear will jam and seriously eff up your cylinder if you try to force it either direction). This is technically not advisable since the spring tension in the cylinder should always be relieved before you remove the spring guide stopper, meaning you should disassemble the gun the normal way.
EDIT: also, the screws that secure the receiver to the body are built into the frame of the body, meaning you will not lose them. There is also no issue with the mag catch flying out or losing a spring.In my opinion, I think the takedown of the MK96 is easier.