The 
Umarex Glock 19X CO2 tan airsoft pistol is a fully licensed, authentic 1:1 replica of the original firearm, known for its realistic blowback action and durable metal/polymer construction. It combines a full-sized Glock 17 frame with a compact Glock 19 slide and fires 6mm plastic BBs. 
Key Features and Specifications
This airsoft pistol is designed for an authentic shooting experience, featuring original Glock markings and a functional trigger safety. 
Power Source: The pistol is powered by a single 12g CO₂ capsule, which is housed within the magazine.
Ammunition: It fires 6mm plastic airsoft BBs (note: a 4.5mm steel BB airgun version is also available).
Magazine Capacity: The magazine typically holds around 14 to 24 rounds of 6mm BBs, depending on the specific product variant.
Velocity: Muzzle velocity is generally around 300 FPS (feet per second) with 0.2g BBs, though some sources list higher velocities up to approximately 410 FPS for specific models.
Build Material: It features a lightweight polymer frame and a heavy metal slide, contributing to its realistic weight and feel.
Blowback: The pistol is equipped with a realistic blowback system, which simulates the recoil of the real firearm and causes the slide to cycle with each shot.
Color: The specific color is referred to as "Coyote" tan, distinguishing it from traditional black models.
Length & Weight: The total length is approximately 190mm (7.44 inches), and it weighs around 630g - 660g. 
User & Expert Opinions
Reviewers and users praise the Umarex Glock 19X for several reasons: 
Realism: It is considered an excellent 1:1 replica of the real steel version, with authentic dimensions, weight, and official Glock licensing and trademarks.
Build Quality: The combination of a durable polymer frame and metal slide provides a solid feel and good build quality.
Performance: The CO₂ blowback action offers a satisfying and impactful shooting experience, with decent accuracy for an airsoft pistol.
Versatility: It features a 20mm Picatinny rail under the barrel for mounting accessories like lights or lasers. 
One point noted by reviewers is that the field stripping process may require the removal of a pin, as the take-down tabs can be non-functioning and molded into the frame on some airgun versions.