At what point did I say velocity would be effected after the gun leaves the barrel?
Bringing up any version of "sniper" in paintball is a completely false statement.
To borrow this from Selino...
Those can only be shot out of 1 type of marker, a pistol. That's it, unless like I said in the other thread that you want to muzzle load one at a time. Joke would be on you. By the time you even start getting the second paintball in the barrel, I've covered over 30 yards, and put another 60 in the air at you. You will have no chance. Also, the range claims have not been empirically tested by a third party.
"Sniper" type paintball guns do exist are accurate at much farther ranges when done properly even with standard issue paintballs.
Name one. I've done this for over 12 years. I've owned every marker worth owning. The only thing that can even attempt to make the claim are flatline barrels. Those have been empirically tested, and don't have additional range, simply a flatter trajectory.. and it's still pointless because the paint won't break at those distances anyways. A paintball that bounces off is the same as a paintball that missed by a mile, doesn't count. Flatline was a marketing gimmick, like perfect rounds, finned sniperballs, etc, which is why nobody really makes them anymore, and every serious player simply use barrel insert kits.
Anybody marketing a "sniper" anything for paintball just wants your money. I'm willing to bet you can't even scratch the surface of my paintball resume, it runs deep. Going off the last line I quoted, but having to resort to Selino's post to attempt to prove your point by using a product that can be used by less than 0.00001% of paintball markers, and hasn't been empirically approved, without listing stuff you "know" works... makes me think you don't have much paintball experience.