If the problem is a misaligned part, you should try gently pressing on the shell until you find a place where there's no give. What's directly under that point is what's (most) out of place. I say most because it might not be the only thing, just what is hitting the shell.
Everything's piss-expensive over here, rapidstrike kits, the ones with the retaliator and 18 dart clips? $38. Forget that.
Besides, i've never been that big a fan of the larger clips anyway, too bulky and not very aesthetic. IMO the newest clips, the 12 dart ones, and the 25 drum are the best of the bunch, a compromise on looks and functionality.
I'd at least figured you'd b able to get them in amazon on their own, but no luck...