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Posted: 12/23/2003 8:58:44 AM EDT
is the front sight base on a flattop upper a differant hight than the one on a standard upper?  thanks
Link Posted: 12/23/2003 10:08:58 AM EDT
On Colt M4s yes.  BM uses the std. frnt. st. base and a higher post.  The added st. radius on 20"s allow the old frnt. st. base to be used.
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