The GF4 series will take the proven success of the GF3 and add an in-house made 16" Cold Hammer Forged Phosphate barrel which has been chrome lined and finished off with a 1:9.5" twist rate. Also, the GF4 features a new Enhanced Polished Trigger (EPT) fire control group which creates a very smooth and crisp break on the trigger pull. As with other PSA AK products, the GF4 comes with a forged carrier, forged bolt, and a forged front trunnion. The rifle is finished off with the very popular Magpul polymer handguard, Magpul Zhukov folding stock, and Magpul AK-47 polymer grip.Specifications:Caliber: 7.62x39mmModel: PSAK-47 GF4Barrel Length: 16"Thread Pitch: M14x1LHBarrel Twist Rate: 1:9.5"Barrel Material: PSA CHF Chrome Moly VanadiumBarrel Finish: PhosphateChrome Lined Barrel: YesFront Trunnion: 4340 AQ Hammer ForgedBolt: Hammer ForgedCarrier: Hammer ForgedFire Control Group: PSA AK-47 EPT Fire Control GroupHandguard Type: Magpul AK-47 Upper/Lower Handguard, BlackGrip: Magpul AK-47 Polymer Pistol Grip, BlackStock: Magpul Zhukov Folding Stock, BlackSights: Standard 800 Yard Rear Sight Leaf & Fixed Front SightSide Scope Mount: YesMagazine: Includes (1) 30rd AK-47 Magazine; Where allowed by law