WTS: Colt M4 upper, matching Colt bolt and bolt carrier group (M16 BCG) and KAC FFRAS. Built by MSTN. Has all the markings: M4, C AF forge, C M 5.56 1/7 barrel, MPC bolt. Bolt has the o-ring extractor improvement. 14.5" barrel so all NFA rules apply.
Condition speaks for itself; about 2k rounds at the range. Never hauled around backcountry. Runs like a top.
Asking $725 USPS MO, extra for PayPal fee. IM or email.
Photos below - NOTE: the barrel is park'd; in order to get the shots of the barrel marks, I removed the surface oil. Oiled up, it's nice and dark grey.