Colt Lightweight barrel, 1-9 chrome lined "4" marked barrel extension. I bought it brand new and it has had no more than 600 rounds run through. Date code stamped 10/99.
Barrel comes with original equipment: carbine gas tube, front sight base and pins, A2 flash hider, barrel nut & delta ring assembly and handguard cap.
* Hand guards are not included.
Contact me via email if you have questions.