If you disassemble your M4 into upper and lower receiver, and place the lower receiver to the side. Be very careful with the wiring as it could mess up your weapon. Remove the inner barrel and place to the side. Remove the gear box and motor plate. Disassemble the gear box until you find the sector gear. If your sector gear does not have a sector clip then you will need to add one in order to shoot high speeds. You will then need to rewire the gear box using a solder gun to modify. You will need to purchase the mod chip and solder it to the wires. I had to do this process twice because the first time it only shot 3 round bursts instead of full auto.
No
Airsoft Megastore 7.00$ -Jeff
I don't no about spring, but the Green Gas M700 Sniper Rifle Competition Professional Airsoft gun, has 720-FPS!!!! And the, Spring CSI L96 Bolt Action Airsoft Sniper Rifle, has 550-FPS. They are both from, Hobby Tron.com
Yes
The Well MB03 Spring Airsoft Rifle measures approximately 38" long.
go for the m14, unless its cheap looking.
if it is electric, or gas, yes. if its spring, its not.
Yes you have to every time. It depends on the spring tension.
Not sure what the question is, be more specific, each gun has its own magazines, and spring guns suck if not bolt action rifles or shotguns.
airsplat.com's Well l96 spring rifle is the gun of my choosing
No, it is not. All spring powered guns need to be cocked for each shot.
MB03 by well