Colt M4A3 upper/barrel assembly removed from a Colt M4 carbine model LE6921. This unit features a Colt factory produced M4 flat top upper receiver with the desirable C AF forge markings. It is also stamped M4 and has the feedramp cuts. The barrel is a pre-ban era Colt M4 14.5inch that has the correct F marked front sight tower and is stamped C MP 5.56 NATO 1x7. This barrel comes standard with dual heat shield M4 handguards and side tactical sling mount. Sorry no bolt/carrier, charging handle, or carry handle available.