I put my 20 inch POF for sale its a great gun, but it shoots as good as may DPMS 24 inch, so I figure I can use the money for a SCAR17 in the future, anyway, so I decided to build a DPMS LR 21inch barrel by taking a 24 inch stainless HB and cut it down to 21 inch then re-crown it, I already own a 24 inch DPMS LR, so I will use the same lower and bolt carrier but a new bolt, I already have all of the parts and just ordered the barrel, should be interesting having a 21 inch barrel. primary purpose is hunting rig while walking, deer hunting out to 600 yards. My 24 inch has taken deer out to 725 yards so I figure this 21 inch should be fine? my 24 inch