Source - The Maryland AR15 Shooters Site
Chrome Lined Barrels & Chambers: To this point SAAMI .223 chambers. In the future they will start offering 5.56mm chrome lined (the barrels are on order as of Mar 2003). CAV Comps are standard on rifles.
Chamber Type: SAAMI
Barrel Material: 4140 chrome/moly
Standard Pins: Yes (Note the take down pins are the standard size, but they are unique to the polymere lower as the detents are built in)
DCM Variant: No
Other Calibers: N/A
Lightweight Styles Available: A2 profile for Carbine & Rifle, M4 profile
Extras: Owner's manual. Sometimes a 10 round magazine, depends how the dealers order them.
Notes: Cav-Arms rifles are unique in that they have injection molded polymere lowers (Nylon 6, similar to what Glock & H&K use). The orginal lowers had buttstocks that were 2" longer than the A2 stocks. New 'new' lowers (post Mar 2003) will have A1 length buttstocks, but use the CAR buffer system. The plastic lower saves weight over the aluminum one, and the use of the CAR buffer will save more weight. This would be a good lower to use for an 'ultra lightweight' AR-15. Since the stock & pistol grip are part of the lower you can't change them. Cav Arms also makes furniture (handguard, A1 stocks, CAR stocks, pistol grips etc) in a wide variety of colors (black, tan, green, gray, blue, red, yellow, pink - even a few glow-in-the-dark sets were made).
Mfr.: Cavalry Arms