The good news: This proves to be the best armed HvZ ever, Triads, Stryfes and Elite Rayven's, Strongarms and some of the best Longshot and Retaliator kits and mods I have ever seen. But still, i see a lot of people held to tradition "Oh i brought this recon the last 4 HvZ's I can't mod it." Terrible attitude, if you are modding shoot for at or below 95 flat, no brass barrels, bring nice tac gear and flat mags.
But on a more complete gun to gun note:
Firestrike: Use a 8Kg or 6Kg Swarmfire spring and bond the piston with Epoxy, you can also use the Orange Mod Works 7Kg Strongarm spring
Triad: Use a 6Kg OMW Vulcan spring, want 8 Kg? well thats a trade secret, 6 will do just fine at 80-85 flat.
Recon: Orange Mod works Massacre kit or or unleashed 1+2 kits, some filing metalwork required.
Strongarm: Keep it stock, really not worth the trouble.
Roughcut: Master key of choice, other than that, keep it stock.
Longsthot: OMW immortal kit, use the 5 Kg Spring only, teflon tape on seals a must. Leave your K26 ed longshot at home, they do you credit,, but they are sure to get you disqualified.
Longstrike: What? I have seen too many lose with this gun, two thumbs down.
Retaliator: Black Tactical V2 spring, OMW trigger catch spring. Also using a OMW Unleashed stage 1 kit and a Xplorer Composite piston really a good choice. Taking out the AR optional, it will add 5-10 feet flat if you do. Teflon tape on seals a must.
Stampede: 4-3.7 volt 14500TR unprotected trustfire batteries, 6 Kg OMW spring, bore out the AR. The Black tactical Stampede kit also good, be sure to seal the tiny hole in the piston or you will be disappointed.
Stryfe: 2-3.7 volt 14500TR unprotected trustfire batteries un rewired, now if it is rewired without the silly capacitor by the battery tray-3, 4 is very questionable but if your insides tell ya, load up for and smell the motors fry to a crisp.
Elite Rayven, same as stryfe, stryfe does better because it is not a buildup design.
Elite Alpha trooper: easy on the bolt, not too much teflon tape or it will auto slam even when you are not holding down the trigger, a 5 Kg OMW retaliator spring and the OMW trigger catch spring is really all you need. 8.5 Kg is nice but not as stable.
Disk guns: Extra mags a must, bring 20's and 10's.
Did i miss any? Also, here's a LONG video on the pro's and Cons of certain guns for the use of HvZ game play.
Here is a vid about my primary if you wanna cut to the chase.