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For you inner barrels, length and diameter all have their different influence on the BB. Tight bores, I guess people are calling anything tighter than stock a tight bore, but I mean a 6.01/6.02 will increase the FPS by potentially 30fps.
On the opposing side, the 6.04+, getting really close to stock size which i think is 6.05 apparently give better accuracy but dont increase fps.
Increasing the barrel length will also increase fps, if im not mistaken.
A hammer spring isn't REALLY necessary. It will increase the amount of force required to be pushed back when the slide pushed it down (increase in gas consumption), but it will also strike the magazine gas valve harder and allow more gas out - still more gas consumption.
I have not broken my m9 nozzle running it on propane and CO2, its the blue one, and im pretty sure they have a 'reinforced' one (might only be the 1911's) that is in all odds probably better than the element one you are looking at. My advice is stick to stock unless it breaks and find a high quality replacement - not sure if airsoft surgeon make any, or POM.
The trigger should go on fine, may need a bit of filing here and there, potentially as all replacement parts MAY. Most TM m9 parts should be compatible - assuming you are looking at take down levers, safety (you may want to research that- there are many models with burst and auto etc), triggers, mag catch.
Yes, do not buy KSC/KWA mags for your kjw. They will not work. TM is the best out there, and if you are looking for a longer mag - look for the barry burton long mag (for the samurai edge) they should be compatible and 33 rounds
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