Underboring (Pump)

[Jamie Innes]

I'm going to get a another pump sometime later this year. I sold my WGP Sniper which I regret.... however it *was* rather inconsistent and heavy as a brick.

Not too fussed on what I will get, in a perfect world... a PPS Nasty Houndstooth. But nah, I don't have $1000 to drop on that right now :)

So it will probably be an Azodin Kaos, Empire Trracer... or perhaps an SM-1 if Tony's actually able to get em.

Wanting to get maximum effcicency since I will be using a 13ci tank. Looking for advice on what underbore barrels are out there and how far to underbore. Ie-

I have a CP 1 piece .685 barrel which I use for speedball which seems a pretty much perfect fit (not an under or overbore) for Elixir and other paints we get.

Right now I'm looking at the 14 inch Stiffi metal free 1 piece which you can get in .679, .681 and .683.

Is .679 too much? is .683 not enough? I wanna get good effeciency and stop rollouts but don't want it so tight it's gonna break paint.

[dannefaerd]

I suppose the question is what paint you're shooting usually?

[Mr Vengeance]

Hi Jamie, I got a Smart parts Stainless freak set. It was pretty average until I used a special stainless steel cleaner. The night before the match, sort your paint, blow it through your barrel or insert and only load the balls that fit. Might I recommend a Sterling, very light, the valving seems to compensate for pressure. And if you are going to run it open class [air/centre feed/FUmode] the slamfire makes a joke of the 12.5 BPS CAP. This is the way to go. The pure stock class option, I'm only here to show you how good I am is $1,000 [retail]. you need to run small hoppers if your sizing every ball. P.S. are you on skype?

[staticman]

I dont think I have ever underbored. You run the risk of an off shaped ball blowing in the barrel. A markers detents should be the thing that stops the ball from rolling out, not a tight fit in a barrel.
I dont agree with blowing every ball thru your barrel and only using the ones that fit well. Not only is this very time consuming, The moisture from your breath will stick to every ball you blow on and cause them to swell and the shell to become soft and bouncy. I personally never open a bag of paint untill I intend to use it.
The best option is a barrel kit with a number of bores. That way you can adjust to the paint being used on the day. A ball should sit in the top of a barrel and only take a small puff of air to push it thru. I recommend the Redz pepper sticks kit.

[hld]

except that alot of pumps do not have detents :P

[staticman]

lol see to me that is just stupid. Why would you not put detents in a marker? Forcing a player to under bore just to stop a ball rolling out of the marker makes no sence.
Having said that I still wouldnt recommend pre testing your paint ball by ball as it exposes them to the environment.

[Mr Vengeance]

We are talking pumps here! Excuisie moi ! what the xxxx is a detent doing in a pump action closed bore marker. I used to train up schoolboys to play in the Kumeu 5's. To get in the team they had one shot. Put a skinny V can on it's edge, back up 25 metres grab a rental marker and one shot to hit it and make the reserve position on the team. To the best of my memory none of the kids missed. Even with borrowed guns[ much to the owners shame]. Good paint, both eyes open, CLEAN barrel. See your target, rear sights, front sight, adjust for range, line up, press trigger and hit target. Or go home and practice. But if you have to use a blow back semi, I personally wouldn't bother trying. But suggestions are triple tapping, or moving up to close the range.

[staticman]

Ok that was random

[suspect]

does the kaos pump (azodin) have detents? it seems to have the covers there. I know it has the triad system (oring slot system on the barrel back) but have never looked at one up close to see if the detents are there.

[staticman]

Ok foot in mouth there on my part regarding detents. had some crossed wires on my part (and a little brain fade lol). Im not afraid to admit when im wrong. I however still stand by the part about not exposing your paint or blowing on it day or days before you use it. A selection of barrel bores to match to your paint on the day is always going to be a good option.

[Mr Vengeance]

In a closed bolt marker How can detents do any thing other than damage the ball and wear the bolt O Rings? If the bore is a friction fit they are worse than useless. I am glad that we all agree that yesterdays paint is crap even if it has been only shot once, but less than 54 seconds exposure to 50% humidity between 15 to 30 degrees celsius, Think about it, the factory is curing millions of balls at a time when the boss says these are good to go, do you really think that they are all sealed within the next 2 minutes? Absolutely, rub them past a detent, bounce them down a large barrel, but make sure they are fresh out of a box with 4 colour printing. Aiming with sized paint is proven, but accuracy by volume is easy, sort of, unless the target is retaliating with aimed shots.

[legionaire]

having never shot a pump im going to add my 2 cents I underbore all the time . .683 is my fav bore although Im looking for a .679 back for my SLY carbon fibre kit . Elixer and ultra evil are my two fav paints and when you underbore you get +- 2 FPS consistancy on my G6r

[Mr Vengeance]

Sorry Staticman. A selection of bores can help, but with field only paint a skilled operator with a decent selection of paint should be able to find a special box that won't work in any gun. Pumps are reliable but accuracy tuning is an old school skill. Test your gun before you take it out. Why not test the paint for accuracy.

[staticman]

I guess I have learnt form experience that paint changes from box to box and even bag to bag in a box so having different barrel options to account for this helps. Haha ive even seen paint change bore as a day warms up or cools down.

[Mr Vengeance]

Legionaire, So do you have long range accuracy, with a superlight trigger and minimum recoil for the followup shots. Obviously you give a couple of warning shots. But where, on the bunker, or past their face? If your first contact is a tight 5 shot grouping then, pumps are fun.

[Mr Vengeance]

So we sort of agree, shoot nice paint through a nice barrel. [but please not at me, a couple of warning shots] A nice tight bore, consistent size balls, and experiment with different barrels to find the most accurate for the gas signature on your favorite marker. All this so it only takes 3.4 seconds of your time to stop your mate playing his favorite game.