Barrel size for a closed bolt marker

[timetopat]

So good news i got my pump action autococker. Its a 2002 prostock and i tested it and it works as expected. No leaks and everything looks good after shooting some paintballs. I know people recommend a barrel kit for close bolt guns so the ball doesnt roll out. Good news is i have a freak barrel from another paintball gun but i want to understand what bore size i should aim for. Ive seen some people say you want to go a chunk under towards .675 and i was wondering if you all had advice for autocockers and pump ones what kind of barrel bore size you normally use?

Thanks,

[Sottyman]

Congrats on the new setup! Generally speaking, paintballs won't ever be the same size from manufacturer to manufacturer or even from batch to batch. It's best to test each bag/case of paint out. Depending on the weather, you could find yourself using a couple different inserts throughout the day (also depends on how anal you are about it). Plenty of resources out there, but here's a quick vid:

https://www.youtube.com/watch?v=8RUenwlJlqs

Hope this helps!

[nak81783]

CP .693 (or your favorite .689-ish or larger barrel) with RedLeaderSB detents. Done. Use two stacked and staggered for really small paint; I superglue them together.

https://www.mcarterbrown.com/forum/buy-sell-trade/dealers-forum/295003-autococker-barrel-detents

[Trbo323]

Congrats on the new setup! Generally speaking, paintballs won't ever be the same size from manufacturer to manufacturer or even from batch to batch. It's best to test each bag/case of paint out. Depending on the weather, you could find yourself using a couple different inserts throughout the day (also depends on how anal you are about it). Plenty of resources out there, but here's a quick vid:

https://www.youtube.com/watch?v=8RUenwlJlqs

Hope this helps!

This is an overbore solution and would require him to buy parts.

He already has everything he needs.

Yeah there is no one size answer. Depends on the paint, the batch and even the temperature and humidity on the day of play. Basically find whichever insert the paint won't roll out of and then either stick with that or go one step down from there.

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[markdem]

Laser-cut / 3d-printed detents are another option to stop rollouts

[SignOfZeta]

As always I recommend “tape”. Black electrical tape, 1-3 pieces depending on how you want to do it. It’s free. You don’t need to change it unless it comes out which it never does if you do it right. You can use it on any barrel. If you go this method you can also act like you know it all, which you will.

For max efficiency and perhaps accuracy you can use a freak system. It will be a thing to mess with forever though. There is no one size to pick, if that made sense they wouldn’t make freaks at all they’d just make every barrel in that size. Think about it…

Both methods work for different people. If you like measuring your paint all day and swapping tubes back and forth to hopefully squeeze two more shops out of a 12g or you’re trying to win a target shooting contest, go for the freaks. If you want to use this time to do a jay and watch ducks land on the water go with the tape.

Wedgits are also a solution. They work exactly as well as tape but if 3D printed or laser cut require *computers* which as we know are the future so if you need to feel young waste a bunch of time on that. If you don’t have time to bleed go with the tape.

[timetopat]

Ive heard people say with pump you want to "under bore" it. Does that mean you purposely want the ball to be a bit snug? Using an insert, tape, or something 3d printed is the idea for the ball to not roll out but require a bit of force?