Will a surefire g2x pro fit into this?

Name: Fenix ALG-00 - Picatinny Rail Flashlight Mount with Quick Release
Brand: Fenix
SKU: FX-ALG-00
Price: 32.95 CAD
Availability: InStock
Rating: 4.8 (4 reviews)

Yes the G2X Pro has a body diameter of 1" which is within the diameter range of the ALG-00.

Fenix ALG-00 - Picatinny Rail Flashlight Mount

The Fenix ALG-00 rail mount is constructed with a keen understanding of what gun users and tactical operators need. With its anti-slip inner rubber ring and picatinny rail compatibility, it can withstand your weapon's recoil, keeping your flashlight firmly affixed to your firearm. A quick release allows you to easily remove it in the field without tools, transforming your weapon-mounted light back into a handheld. Its adjustable diameter accommodates many different flashlight sizes, so you're not cornered into pairing it with one light. And its body is made from the same anodized aluminum as your flashlight, giving it the same drop-proof, nearly indestructible qualities you value in your light.

Adjustable diameter design to match with flashlight diameter of 22.5 - 26 mm (0.89" - 1.02"), such as: TK32 (2016), TK15UE, TK16, PD32 (2016), PD35TAC, etc.

What's Included:

ALG-00 Flashlight Ring
Allen Wrench
2 Spare Rubber Cushions

Precision machined aluminum with anodized black matte finish.
Quick rail clip
Adjustable diameter design to match with flashlight diameter of 22.5-26 mm (0.89-1.02 in), such as: TK32 (2016), TK15UE, TK16, PD32 (2016), PD35TAC, etc.
Anti-skid rubber cushion
Length: 1.38 inches (35mm)
Width: 1.81 inches (46mm)
Height: 1.69 inches (43mm)
Weight: 1.98 oz (56 grams)