Yes , true, so it's too late on this occassion. But, if you need to do it in the future, cut off the barrel(s) just in front of the receiver of each gun, leaving just a stub. Put the barrels in a safe place, then, glue the remainder of the gun into the relevant position as normal. Complete the model, including all paintwork and decals, then glue the barrels in place when you attach all the other delicate bits, such as antenna masts etc.