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counter clockwise means you turn it left to tighten.
clockwise is you turn it right (standard threading for nuts and bolts/screws is this righty tighty lefty loosey)
14+ is 14mm clockwise
14- is 14mm counter clockwise.
You need to match what your gun is... so fi your gun is 14- you need a suppressor with 14- threading.
30mm on the aimpoint I believe refers to the diameber of the lense aperature most tube red dots are 30mm unless you go micro sights.
20mm rails are a standard width. I think there is 11mm as well but that's for pistols.
if you are shooting 390 with .25s you are already over the limit for every public field and event in ontario. You need a spring swap to bring it down to 400 using .2s (or roughly an impact of 1.5 joules) Using lighter ammo will result in a higher speed. To get under 350 you'll need an even weaker spring. So you have to decide if you want to get a spring that puts you under 350 with .2s or change the spring so it's under 400 for outdoor use. If you choose 400, you can't use that gun indoors until you swap the spring to a weaker one. Just put in an m90 and be done with it, indoors and out and not worry about fps if you have to ask all these questions.
Eventually you'll learn a bit more and decide what to do then.
imo, external accessories are not mods. You're dressing up your gun, not making it shoot better.
A spring swap is a mod. There's plenty of info all around to show you/teach you how to do a spring swap, if after your research you are not comfortable doing it yourself, contact a gun doc and have it done for a fee.
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