Pictured below is a used Colt M4 barrel in very good condition:
* marked C MP 5.56 NATO 1/7
* date code "21"
* front sight base marked F "R1" (inside a circle) and 10
* no bayonet lug
* it has been reparked
* gauges "like new" (throat erosion gauge)
* two small dings in front of the FSB (appears to have had something clamped on)
* M4 barrel extension
Asking price is $
SOLD delivered. PayPal okay. (firstname.lastname@example.org
Thanks for looking!
PO Box 232163
Anchorage AK 99523