Tactical RMR Red Dot Sight Reflex Scope Adjustable Aiming Optical Riflescope Fit 20mm Rail Airsoft Glock 17 19 AR15 M4 Color:Black Lens Cover 2 Wireless Connectivity: Equipped with Wi-Fi

Wireless Connectivity: Equipped with Wi-Fi connectivity

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Unit Dimensions：18

Then according to your actual length

ThinkPad X1 Carbon

Tactical RMR Red Dot Sight Reflex Scope Adjustable Aiming Optical Riflescope Fit 20mm Rail Airsoft Glock 17 19 AR15 M4 Color:Black Lens Cover 2 Wireless Connectivity: Equipped with Wi-FiSPECIFICATIONS Brand Name: LAMBUL Type: handgun Origin: Mainland China Hign concerned Chemical: None Function: Red Dot Model Number: RMR Red Dot Sight Scope Airsoft Glock 17 19 AR15 M4 Color: Black Tan Material: Aluminum Battery: 1xCR2032 Fit: G17 19 20 22 23 26 27 29 30 31 34 35 36 37 41 Magnification: 1x Day Reticle Color: Red Night Reticle Color: Red Product Features: 1, Extremely low power consumption 2, Windage and elevation click adjustments 3,