It's not a Geo2, honest..
Join Date: Mar 2004
Location: London, UK
All Ego and Etek bolts are interchangeable, so which bolt you choose shouldn't be an issue. Chances are that anything other than the stock bolt won't be cut to match the back of the marker's bolt chamber, but they will work.
The only thing that can be an issue is the bolt pins - bolt pin length has changed from year to year, and using the wrong pin can mean that the sprung plunger hasn't got a location to lock in to, and this can lead to the pin keep popping up when you fire. Best to swap the pin from your stock bolt to the new bolt.
Having said that, some of the newer bolts, as well as aftermarket bolts, don't come with a pin anyway, which resolves the issue, and keeps the price down - with no pin supplied, you have to use the stock pin anyway.
Just to clarify one point, the Cure3 does not have inserts - the Cure3+ does.
The Cure3 is quite similar to the Cure2 that you already have, with the deeper ramped Cure groove on top, and the scallop at the front to clear the breech, despite the extended front of the bolt. So far, so similar.
The Cure3 though extends the ramp back a bit further, and the extended area is actually horizontal, not slanted, and with the bolt forwards, it is under the feed neck. The idea is that once the Cure groove has lifted a part fed ball out of the way of the bolt, rather than shoving the ball all the way back up in to the feedneck, the ball can actually be part way in to the breech, sat in the groove on the top of the bolt. The benefits of this are two-fold - less pressure placed on the ball stack, and so less change of crushing paint; and with the ball already part way in to the breech, feeding may be improved.
The Cure3+ takes this already improved bolt design, and then adds the inserts.
Now here's a second point to clarify - at this moment in time, there is only one insert available, which is the one that is supplied with the bolt - a ramped inlet. Ramped inlets generally help with efficiency, as they promote smoother, less turbulent air flow. That can allow more air to flow in the same time, boosting velocity. This in turn allows for a reduction in dwell, or a reduction in HPR pressure.
The SLs version of the Cure3+ does have a range of interchangeable inserts available, but these do not fit the Ego10/retail version of the Cure3+ - the inserts are a different size. Violent Products have been developing inserts for the retail bolt, but as of yet, there is no confirmation of when - or even if - these will be released.
The inserts are made to have different effects on the performance of the bolt, and are things you change to have a specific effect on your marker, rather than things that you change at intervals through necessity. For instance, you may have the ramped insert for efficiency, a ported insert to spread the air blast over the ball, another insert to deaden the sound of the shot and so on.
The problem is that while the ramped insert may be intended to improve efficiency, some of that efficiency can be lost, as the bolt is not sealed in the breech (no o-rings), so the size of the bolt and breech will dictate how well the bolt seals the breech. If you happen to have an undersized bolt and oversized breech, then you can feel air escaping back of the bolt chamber.
This is where the Hush bolt comes in. It actually has what is often considered to be a less efficient design - a ported face rather than an open face. A true venturi design could actually cause acceleration of airflow, but fact is that most paintball "venturi" bolts do not actually use the true venturi effect. As such, ported bolts are often thought as being more restrictive to air flow than an open faced bolt. Where the Hush bolt has an advantage though is that it is sealed in the breech at three separate points (bolt tip, in front of the air inlet, and behind the air inlet), helping to prevent air loss. As such, a lot of people have stated that they have found the Hush to be more efficient than the Cure bolts. Some people have experimented with adding o-rings around the inlet of the Cure bolt, but that's a different story.
The Hush bolt's ported face also helps to lower the sound signature of the marker, and may also make it softer on brittle paint - that's in relation to firing the ball, not feeding it, where it is safe to assume that the Cure bolts design features would give it the advantage (again, were it not for the lack of o-rings, the Cure bolt's open face may actually have allowed for a lower operating pressure, which would have counteracted the advantage of the Hush bolt's ported face).
It may be a gross oversimplification but in many respects, your decision can be made as simply as this - if you are looking for a bolt that minimises paint breakage, go with the Cure3+; if you want a bolt that may make your marker quieter and more efficient, go with the Hush.
Last edited by Uziel Gal : 07-21-2010 at 04:01 PM.