WOW ... awsome site

thanks so much guys im gonna go ahead and check these sites out

and start savin up money ^_^ ..
got a couple of more questions.. lol as i go through these sites and espically that great resource thread:
does the kit make it faster or does it depend on what trigger ur using?
is a "PCS US-5 MX-16 Barrel 16 Inch Spyder Threaded" barrel good for me to use? even tho it might look tacky... idc as long as its 16 inch lol.. judgin from facts i dont wanna go to farther then 18in.. and i just happen to find this one for cheap.. so is it good?