The CAA Licensed airsoft M4 CQB is manufactured by King Arms. Kings Arms has stepped up their quality recently. This rifle features a quick change spring system. 

The CAA M4 Series is a line of full metal contrsucted AEG's with different styles. 

Features:

• CNC Machined Aluminum Rail System 
• Official CAA trademarks, with an unique serial number
• Ergonomic nylon fibre pistol grip 
• Nylon fibre skeleton style stock
• 8mm bearing gearbox 
• Low profile rear and front flip up sights