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14mm- is the same as 14mm counter clockwise.
14mm+ is the same as 14mm clockwise.
A 14mm- barrel is the most common threading in airsoft. A 14mm- suppressor or flash hider fits a 14mm- barrel and vice versa. Most suppressors are able to fit both + & - threads.
A lighter bb will increase your FPS, it requires less energy than a heavier bb to get them to the same speed. Using bb weight to change your FPS is not an acceptable way to meet the FPS limit, that's why you're required to crony with a .20g bb. You need to change the main spring (to a weaker spring) inside your mechbox to get it shooting with less energy. An M90 should get you down below 350 FPS. If you're not comfortable changing the spring on your own find a gundoc on ASC to do it for you. Often times your retailer can change your spring for you, or if the arena you're talking about is Ultimate Airsoft I believe they have spring changing services there.
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