i finally found the time to take the mid length out and give it a try.
i fires about 120rounds of golden bear 62 gr HP's and some mixed IMI m855, wolf 62 polymer and brown bear 55grain. i used Pmags and D&H with the anti tilt followers. the thing ran like champ right out of the box without a hiccup. no miss feeds, short strokes--no problems. considering that this rifle is just made out of left-over parts i think she is running pretty darned good.
runs smooth too--can't say it runs better than my m-4s yet, but it is certainly every bit as good. very much fun to shoot.
parts used in the build
DTI-mid length barrel 1in9 twist NATO chamber, upper DPMS? square markedBAC a3 flattop,DPMS charging handle, debranded colt military bolt carrier with unknown bolt and auto-store o-ring, white-oak gas tube ,RR mid length handguards, DPMS three prong flash hider.
lower cav-arms polymer/plastic lower unknown carbine buffer and spring but i think they are DPMS. mixed up lpk with armalite trigger,CMMG hammer assorted pins and springs from M&A.