G27 is a subcompact version of the standard size G22 (using .40 S&W ammo) which fires the same round as G22. It comes with a smaller frame, a shorter barrel and slide,  also can share the same mags that G22 and G23 used. 

Features:
Metal Slide with “G27 Tactical” marking.
Plastic Lower Frame with “WE” marking and comes with an extended slide stop.
Realistic trigger finction same as real steel.
Semi Auto Pistol with blowback action.
Luminous Front and rear sight.
Adjustable Hop-up system.
Included 14 rounds G26/27 Magazine with a black mag base .
Compatible with WE G19/23 20 rds mag, WE G17/18 25 rds mag and WE 50rds Glock long mag.
Also Compatible with TM / Stark Arms G17/18 25 rds and 50rds long mag.

Specifications:
Length: 160mm
Barrel Length: 73mm
Shooting Mode: Safety (Sepearted, under the lower frame) , Semi-Auto
Weight (g): 580 (Gun with mag), 770 (with box)
Color: Black
Gas: 8KG (134a), 12KG (Green Gas)
Magazine Capacity: 14+1 rds
Material: Metal, Plastic
Bullet type: 6mm BB
Power (Muzzle Velocity): 300 FPS
Manufacturer: WE