the KWA's have a lot better hop-up system now.vindicareassassin said:In short there are 2.....
1/ The ICS M4
2/ The Systema PTW
Everything else is let down by a shockingly inconsistant hop system.
They are upgradeable, but even then will not get anywhere near the shot to shot consistency of a barrel design hop unit.
I don't know where you are getting your info from but sticking in a longer barrel will not, under any circumstances, increase your range more than a few feet, and only then because of the extra 25 or so fps it will generate :slowscoper52 said:EDIT: i would also reccomend that for upgrades that you find a silencer and get a longer tightbore because the standard dosent reach out much farther than some G&G m16s