1. Colt M4 14.5" 1/7 chrome lined machine gun barrel, not 'F'-marked, M4 feed ramps, with front sight post and detent and spring, new condition (never installed on an upper or fired), very minor surface rubs will probably disappear with a little oil, but I'm leaving it dry as it came, I bought it new in bag, but discarded the bag long ago and never used the barrel (bottom in picture). $275 shipped.
2. Colt M4 14.5" 1/7 chrome lined machine gun barrel, not 'F'-marked, M4 feed ramps, no front sight post or detent or spring, excellent condition take-off barrel from a PD that went with commando barrels instead, probably only test-fired at the factory as a complete gun and then removed at the PD, oiled and beautiful like new on the outside, very slight signs of having been fired (a little dirt/carbon in the barrel extension), basically like new (top in picture), $225 shipped.
Buy both Colt barrels for $475 shipped or possible trade up or down for M16 items like a POF NFA-length gas piston upper, ARMS bi-level SIR, shorty polygonal-rifled barrel, RRA or similar 9mm flat-top upper receiver (no barrel or bolt), ARMS #19S, some sort of mid-length accurate semi-auto complete upper receiver assembly or just the barrel and matched bolt (SPR-like), nice gray Colt flat-top upper receiver, excellent or better condition Colt 11.5" barrel, or maybe something else cool that you may have that I have not thought of.
3. Tango Down vertical foregrip, like new, very beefy and tough compared to KAC and others, $45 shipped. SOLD PAYMENT RECEIVED.Click for Picture
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Edited to revise descriptions, update availability, lower price, and offer trade.