[Benny-x]

Hey guys, been surfing around here for a little while and finally I guess it's time to put a few of my questions out there.

I've got a TM P226 and I'm looking at doing some upgrades to it. I've seen that Guarder and Prime both make full metal packages for it, so what's the real difference between them besides full CNC and die-cast?
I can also see that the Guarder one is $112 and the Prime one is $375.
I haven't seen anyone that has the Prime railed kit like I want to get, so if anyone does have it would they be able to show some pics?

Also for the other upgrades I was thinking of
1. a new recoil spring (150%) for the new slide weight
2. a Nine Ball high flow valve with those litle bearings
3. a hammer spring (130%), is this item really needed?
4. Guader enhanced loading nozzle
5. Nine Ball tight bore barrel (Tanio Koba makes a rifled one, does anyone has one of these or know if it makes any difference?)

I think that is all that I want to do, the metal frame being the biggest (most expensive) question at hand. If there is anything else that anyone thinks is also good to upgrade I'm all ears. So yeah, anything or anyway that anyone could help me is much appreciated.