The 15A4CBA2 combines the flexibility of the MIL STD 1913 upper receiver with the strength of the fixed A2 front sights, and ArmaLite's exclusive mid-length handguards provide the handiness of a 16" barrel, flexibility in grip position and optimal gas pulse to power the operating system.
*Sights,Scopes, and mounts not included with Rifles.
.750 at the journal (under the gas block)
Length of Pull: (collapsed) 10.4" (Extended) 13.7"
Caliber: .223/5.56 X 45 mm NATO
Barrel: 16" Double Lapped, Chrome Lined\Chrome Moly Vanadium MIL-B-11595-E
Rifling Twist: RH 1:9" 52-69 Grain Ammo
Muzzle Device: Flash Suppressor, Threading:1/2" - 28
Front Sight Base: A2 Front Sight Assembly
Upper Receiver: Forged Flattop with Picatinny Rail, 7075-T6 Aluminum
Lower Receiver: 7075-T6 Aluminum (forged)
Trigger: Tactical Two Stage, 1st Stage 3.5 lbs - 2nd Stage Approximately 5-6 lbs.
Overall Length: 32.5" / 35.8"
Weight: 6.5 lbs
Finish: Anodized Aluminum Upper/Lower Receiver, Manganese Phosphated Steel Barrel
Accuracy: 2 - 2 1/2" MOA
Included with Rifle: One 30 Round Magazine, Owner's Manual, Limited Lifetime Warranty