First of I was a little afraid of buying a tightbore because i had heard they jam. and for a while i thought my fears were confirmed. But once i further inspected the hop-up i found that i had installed it wrong. With the barrel rotated to the proper position i popped another clip in and took a shot. With the hop up turned off I found there was a VERY significant range increase. (But keep in mind this was for my P90 so it was also longer than the original barrel) I am very happy with my purchase.
perfect fit for a P90 w/ a PS90 extension
requires certain skills to install
requires more care than a regular barrel (or so I hear)
NOTE: When you install the barrel you will notice a port towards the back. This must be facing up so that the hop-up bucking can take effect. You can tell if it's installed wrong because it'll seem like your shooting some cheap wal-mart gun.
Rating: [5 of 5 Stars!]