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Old 09-03-2012, 09:02 AM   #1 (permalink)
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Detents in a pump?

I am new to pump, having just picked up an Empire Sniper (been using electros for years). My question is this- If the bolt pushes the ball past the detents when you pump it forward and ready to fire, what is the purpose of the detents in this particular marker? To prevent double feeds? Aren't there some pumps that don't use detents? Could you theoretically remove the detents and underbore to prevent roll-outs? Does gravity feed and electronic hoppers come in to play? Set this pump newb straight, haha!
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Old 09-03-2012, 09:13 AM   #2 (permalink)
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detents on any pump are just there to stop double feeds nothing more. to stop rollouts you need to underbore. If you removed your detents you'll most likely double or triple feed almost every shot
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Old 09-03-2012, 02:10 PM   #3 (permalink)
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detents on any pump are just there to stop double feeds nothing more. to stop rollouts you need to underbore. If you removed your detents you'll most likely double or triple feed almost every shot
Simple enough, thanks!
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Old 09-03-2012, 10:58 PM   #4 (permalink)
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There are however some pumps with detents that function as detents. The Phantom has a slightly extended breech which some outfits like ASP have put detents into with a little milling. The ASP Roundhead body has both the detent mod and uses Cocker threaded barrels, greatly increasing your options for barrels to underbore with (something I still do on a pump even with detents).

ASP Detent Mod
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Old 09-03-2012, 11:22 PM   #5 (permalink)
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Some pumps do have a detent system that functions to prevent rollouts, such as the Grey Ghost.
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Old 09-05-2012, 08:58 PM   #6 (permalink)
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Like said before you can underbore the barrel to prevent rollouts(I run a 682 insert and it works for most paint) and you said you have a empire sniper so the 680 back should be fine. another trick for rollouts (if you have a loose bore barrel) is you get a small strip of electrical tape and put it on the inside of the barrel.

as for elctric vs gravity hoppers the only thing that is really different is with electric it makes sure there is a ball in the breech everytime you shoot and gravity yo might have to shake it every so often, I run a sport shot and it rarely jams and when i does just shake it
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Old 09-05-2012, 11:57 PM   #7 (permalink)
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Some pumps do have a detent system that functions to prevent rollouts, such as the Grey Ghost.
This is possible because a some Nelson-based pumps (Like the Ghost, Phantom, SL-68 II*) use an original Nelspot-style breech-drop style bolt, as opposed to the later bore-drop configuration used today by the Empire Trracer.

Apart from the detent issue, there are various advantages of each bolt shape such that debating which was better was one of the first mag/cocker-style debates in paintball lore.




*While the SL-68 II is breech-drop you can't fit it with non-barrel detents for various design reasons.
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Old 10-11-2012, 01:19 AM   #8 (permalink)
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detents on any pump are just there to stop double feeds nothing more. to stop rollouts you need to underbore. If you removed your detents you'll most likely double or triple feed almost every shot
I've got a 94 sniper that disagrees with that statment
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Old 10-11-2012, 02:15 AM   #9 (permalink)
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I've got a 94 sniper that disagrees with that statment
and that will lead to whole new argument over that too.
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Old 10-11-2012, 08:02 AM   #10 (permalink)
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I've got a 94 sniper that disagrees with that statment
agreed.. I played a 94 (pre-detent) for years. Never had a problem except for roll outs and 1" of surgical tape fixed that. er.. don't drink the Kool Aid
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