BudsGunShop.com - 2 parts, length, caliber.

Michael, the overall length is 32.5 inches (collapsed); 36.5 inches (extended)
You cannot shoot .308 in this rifle, only 7.62x39
Stay safe & have a great day!

Specifications
Caliber: 7.62 x 39mm
Barrel Length: 16 inches
Barrel Material: 4150 Chrome Moly Vanadium Steel
Barrel Finish: Melonite
Twist Rate: 1:10
Gas System: Carbine Length
Muzzle Device: A2 Flash Hider
Upper Receiver: Forged 7075-T6 Aluminum
Lower Receiver: Forged 7075-T6 Aluminum
Handguard: Free Float Radical M-LOK
Charging Handle: MIL-SPEC
Bolt Carrier Group: 7.62x39mm HPT/MPI
Trigger: MIL-SPEC
Pistol Grip: A2-style
Stock: 6-Position Collapsible
Magazine Capacity: 30 rounds
Weight: 6.5 lbs (unloaded)
Overall Length: 32.5 inches (collapsed); 36.5 inches (extended)
SKU: FR16-7.62X39HBAR-15RPR
UPC: 816903023011

Hi Michael and welcome. Overall Length is adjustable from 32.75" to 35.25" and it only shoots 7.62x39 only and not .308. Cheers and stay safe!