SCARCQB
Get Opp my rawn, Plick!
Colt's website says the AR6721 has a 1:9 twist rate which is the only thing I don't like.
http://www.coltsmfg.com/Catalog/ColtRifles/ColtCarbinesII.aspx
My Brother has one and it states 1:7... maybe a fluke? or an older model
Here what is says on the manual:
Colt AR6721 AR-15 5.56mm NATO Semi-Automatic Rifles
The Colt AR6721 AR-15A3 Rifle in 5.56mm features a 16-inch heavy barrel with 1 in 7" twist, matte black finish, flat top upper receiver, removable carry handle, 4-position telescoping buttstock, front adjustable post sight, rear adjustable sight, bird cage flash hider, front barrel lug, ejection port cover, cartridge case deflector, an overall length of 32 inches, an unloaded weight of 7 lbs, and a 20+1 round capacity.
The Colt AR6721 ships standard with the following: box, two 20rd magazines, sling