The NUPROL Perfect Fit Airsoft Holster (GTP9-USP) is a dedicated Level II retention holster specifically designed to accommodate G&G GTP9 and USP-series airsoft replicas. It features a modular "Roto" design that allows for 360-degree adjustment across 40 different locking positions. 
 
Key Specifications
According to technical data from Nuprol.com and UK-Airsoft.co.uk, the holster is built for durability and rapid deployment: 
Material: Constructed from high-performance PA6 Nylon, chosen for its balance of rigidity and flexibility.
Retention System: Utilizes a "Quick Draw" Release Lever that locks onto the trigger guard, ensuring the sidearm remains secure during movement but is easily accessible.
Mounting Interface: Features a 40-slot, 360-degree orientation panel, allowing users to customize the draw angle to their preference.
Included Accessory: Typically supplied with a Hip/Belt Retention Paddle that features a silicone coating on the face to increase friction and improve fit against the body.