what Upper fit DPMS lower ??

Pretty much any upper should fit your DPMS. Colt is the only AR maker that used the goofy pin size for their lowers(that I'm aware of), and they have since gone back to the standard pin size. Plus the pin size won't make a difference as to the upper fitting, pin size has to do with the lower parts kit. Any spec upper should fit your DPMS lower, provided that it's an AR 15 and not an AR10. Some fit a little looser than others, but a $3 accu-wedge will tighten it up.
 
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