The Purpose of the sizer section on the Stiffi Switch is this, and nothing more, to prevent a chambered ball from rolling out of the barrel. Anyone who claims the sizer will do more than this is obviouslyu trying to sell something.
The concept of the sizer, or at least a changable sizer as far as I am aware, originated from pump guns like the WGP Sniper/Autococker and the CCI Phantom. The first aftermarket barrel that I can recall that had a set of these interchangable sizers was the OTP serries of the barrels for the Autococker that had little sizer rings. I know that something similar is currently avalible for the Phantom though OTP has stopped making the this style of barrel. Other companies such as LAPCO have made bore sizers similar to the Switch Kit for a number of years as well.
Barrels that use inserts, like the Freak and Scepter, are extensions of this original concept.
For the Switch, it's a .691 Stiffi barrel with a step to .700 and a set of bore sizers to keep paint from rolling out the barrel for any paint smaller than .691 and a little different dressing so you can't directly screw the barrel into a gun. Not worth $200 or what ever they're runnign for these days. Hardly even worth $150 imo but hey. That's just me.
EDIT - And I can't recall who it was, I believe it was AGD that did this test, but they found that overbored barrels left a "zebra stripe" pattern on the inside of the barrel after firing indicating that the ball was moving between the various internal surfaces of the barrel as it traveled. Barrels that saw better matches had, generally 2 stripes running cleanly down the inside of the barrel which got wider or increased in number as the bore of the barrel approached and became smaller than the paint. For those of you that have a hard time wrapping your head around the thought that a paintball can bounce off the internal walls of the without breaking consider how small the angel is that the paintball is striking the barrel surface at AND think about the last time you had a paintball skip off of your head.
The concept of the sizer, or at least a changable sizer as far as I am aware, originated from pump guns like the WGP Sniper/Autococker and the CCI Phantom. The first aftermarket barrel that I can recall that had a set of these interchangable sizers was the OTP serries of the barrels for the Autococker that had little sizer rings. I know that something similar is currently avalible for the Phantom though OTP has stopped making the this style of barrel. Other companies such as LAPCO have made bore sizers similar to the Switch Kit for a number of years as well.
Barrels that use inserts, like the Freak and Scepter, are extensions of this original concept.
For the Switch, it's a .691 Stiffi barrel with a step to .700 and a set of bore sizers to keep paint from rolling out the barrel for any paint smaller than .691 and a little different dressing so you can't directly screw the barrel into a gun. Not worth $200 or what ever they're runnign for these days. Hardly even worth $150 imo but hey. That's just me.
EDIT - And I can't recall who it was, I believe it was AGD that did this test, but they found that overbored barrels left a "zebra stripe" pattern on the inside of the barrel after firing indicating that the ball was moving between the various internal surfaces of the barrel as it traveled. Barrels that saw better matches had, generally 2 stripes running cleanly down the inside of the barrel which got wider or increased in number as the bore of the barrel approached and became smaller than the paint. For those of you that have a hard time wrapping your head around the thought that a paintball can bounce off the internal walls of the without breaking consider how small the angel is that the paintball is striking the barrel surface at AND think about the last time you had a paintball skip off of your head.





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