Born from the idea of a soldier being able to resupply behind enemy lines and operators being able to leave a smaller footprint to conceal their presence, the SR-47 combines the familiar M4/M16 with the legendary 7.62x39mm cartridge used by the AK-47. The SR-47 was designed to allow operators to utilize munitions acquired on the field from the enemy in situations where resupply is not an option. Additionally the SR-47 has the added benefit of sounding like a typical AK-47 and not an M16 which helped mask an operator’s presence as well as being able stay covert by not leaving any evidence such as casings from a NATO weapon. The CYMA AR47 is a hybrid gun that at its core is an M4/M16 platform based on the venerable Tokyo Marui Version 2 Gearbox but with a sprinkling of AK flair. This essentially allows you to run an AK like setup, but with the ergonomics and modularity of an M4. This also gives the rifle a plethora of upgrades and customization internally and externally as both the M4/M16 rifle platform and Ver.2 gearbox are among the most popular in the industry. New to the CYMA lineup is the Quick Buffer System (QBS) which allows for rapid spring changes that can be done by hand. This efficient new system only requires the removal of your buffer tube castle nut to gain access to the captured guide rod and spring. No longer is it necessary to break open your receiver or even remove your stock from the buffer tube to change a spring. Magazine: 180rd Mid-Cap. Works with Tokyo Marui, Matrix, G&P and other compatible AK Series Airsoft AEG Magazines Rounds Per Second: 17 RPS, 28 RPS (7.4v, 11.1v respectively) Gearbox: Ver 2 Metal, Upgradeable Motor: Long Type Fire Modes: Semi/Full-Auto, Safety Package: Gun, Magazine Battery: 7.4v Small LiPo Recommended. Wired to the rear w/ Small Tamiya(Battery not included) Hopup: Yes, Adjustable