f4 illustrator with expansion chamber, gas through stock, remote, j&j cermaic 14" barrel, smart parts wood grip
i would say a J7j ceramic barrel and an expansion chamber, but neither are necessary
fast firing, accurate at very long ranges, easy to field strip and adjust fps
none at all
i played with various spyder's for a long time, and got a deal on an f4 that i couldnt pass up. 75 bucks for a whole set up. i spent a little more customizing it, but all in all i spent only around 120 bucks. this marker hands down out performs every other marker in its class, and some in classes above it. once i added the cermaic barrel i was watching shots soar yards past what a spyder could ever do, and the shots were much more accurate than the spyder. the trigger is light and you can field strip the entire gun in less than 3 minutes.
if you need an entry level marker, or want a cheaper marker that can easily be upgraded to out-perform more expensive models, this is your gun. only downside is a small aftermarket, but you honestly dont need to change anything. only things you would "need" are an expansion chamber and a j&j ceramic barrel.