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Kenneth, this has a .750 Low Profile Gas Block and uses a mid length gas system. Stay safe & have a great day!

Hi Kenneth and welcome. This mid-length gas system has a .750 Low Profile Gas Block. I recommend an adjustable unit for a wider range of load versatility : https://www.budsgunshop.com/product_info.php/products_id/35767/br+adjustable+gas+block+750+id - Cheers and stay safe!

Specs for this Model Below, Including Gas Block info.

SKU: FR16-5.56SOC-15RPR-MFT
UPC: 814034026420
MFR#: RF01590
Barrel Length: 16"
Barrel Material: 4140 Chrome Moly Vanadium
Barrel Finish: Melonite
Barrel Profile: SOCOM
Barrel Thread Pitch: 1/2x28
Chamber: 5.56mm
Twist Rate: 1:7
Barrel Extension: M4 Feed Ramps
Gas System: Mid Length
Gas Block Type: .750 Low Profile Gas Block
Muzzle Device: A2 Flash Hider
Upper Receiver Material: Forged 7075 T6
Upper Receiver Style: M4 MIL-STD
Upper Receiver Finish: Type III Anodizing
Forward Assist: MIL-STD
Dust Cover: MIL-STD
Handguard Type: Free Float
Handguard Style: M-Lok Thin Rail
Handguard Length: 15"
Charging Handle: MIL-STD
Lower Receiver: Forged 7075 T6