I have a Colt AR15 A2 model 6520 Gov't Carbine. It has the 16" barrel with 1/7 twist. It is chambered for 5.56mm NATO and 223 Remington. Has OD green buttstock and pistol grip. This rifle has only had 20 rounds run through it when I zeroed in the iron sights. It is zeroed at 100 yds. Basically a brand new rifle. I purchased it a month ago. But I have come across another weapon I would like to add to my armory so as much as I hate to do it...I must let the Colt go. I paid almost $2,000 for it. So I'm asking $1600 FIRM. Cash only. You can E-Mail me at firstname.lastname@example.org or call me on my cell at 316-293-7324 I live in the Wichita, KS area. Here are some pics...NOTE*** quadrail,laser,light, and foreward grip not included.