no
Nope.
use the cheatengine
by earning medals
you can get it from the stealth gear on the elite gear on the spy phone.
you do field-ops
Paintball gear is what keeps you safe in paintball. The mask is the only truly crucial piece you need to play paintball (meaning you can walk onto a field without a gun, or tank or paint).
You can buy it on your spy phone on Elite Gear.
you unlock the APC
There is a company called The Dry Gear Cast. This is what the company is known for and specialises in. They are on the top of their field for doing so because it is rare.
The gimmick gear is retrieved by racing the messenger in Shinshu field.
No. Simply changing the gear without doing anything else won't slow a bicycle down. You can coast along without peddling and that will slow you down or you can use the brakes to slow the bike. Changing gears will affect the speed only if the current speed is slower than the highest speed you can reasonably attain with the selected gear - changing to a higher gear will help you speed up.
The Elite gear on the spyphone.