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Dees_Troy Thursday, June 7th, 2007
Period of
Product Use:
3 months1 of 1 people found this review helpful.

More than 5 years
Products Used:
Just about anything e-cocker that's worth looking at including the mQ
Marker Setup: Delrin Turtle Mini Midget Autococker
e2 eBlade with Powerex 9.6V battery
MP4 Ram
Tickler LPR
Twisted products LPC / front block screw
CP Shorty HPR
MQ Valve
Pulse with RF chip
45/45 Crossfire tank
Deadlywind Wisper carbon fiber barrel with full Freak set of inserts
Super high flow reg and tank
Strengths: Fast cycle speeds
Weaknesses: Gas hog
Added weight & size
Review: The particular marker I used was an Evolution body that was mini'ed and Turtled with an Osiris kit using a Race frame with breakbeam eyes installed. It had a Rat 3:16 valve and a CP main reg fed by a high pressure Crossfire tank.

The Osiris is simply a spring returned ram that is hooked to a second LPR and an additional air solenoid. The whole valve setup is similar to a spring returned BKO. You still use just about any standard autococker valve, but instead of a hammer, you have a large ram placed where the hammer used to be.

First things first. I could get the bolt to cycle extremely fast on this thing as there's no hammer or springs to worry about. However, at these rates of fire, there simply was not enough gas fed to the marker to produce the burst of air needed to fire a paintball. The first few shots would go pretty far, but by about the 4th shot, there just isn't much air coming down the barrel. Some will point out that mine was a mini and that the smaller air chamber is to blame, but I must point out that a larger volume of air at a high rate of fire will only help with so many shots. If you shoot a string of 50 paintballs and the marker is such a gas hog that your HPR and/or tank can't keep up, then no size of air chamber is going to fix that problem. The larger air chamber will simply let you fire a few more balls at full speed before the problem shows up (unless you want a chamber the size of a SCUBA tank on your gun, then you might be ok).

The extra ram on the Osiris is quite large with a fairly large bore. It takes a decent amount of air to shove this thing forward at speed fast enough to overcome the spring return and hit the valve with enough force. You're going to use a lot more air with an Osiris, so plan on getting maybe 600 shots on a 68/4500.

The Osiris adds a decent hunk of height to the marker. They install a roughly 3/4 of an inch tray between the trigger frame and the body of the marker. This is to allow enough room to house the extra solenoid in the grip frame that's required to operate the new ram. You also have an extra LPR on the front and some hose running into your grip. This adds a lot to the size or profile, a decent hunk of extra weight, and provides a lot more potential for a leak to occur in that extra LPR hose and barbs. Cleaning the front block is now even harder as you have yet another LPR to try to clean around in the already crowded front block.

The reason most Osirises don't have eyes is because you can turn the LPR for the bolt way down since there's no hammer or spring to recock. This should allow you to pinch balls.

The new ram setup can produce very inconsistent velocities. The ram in the lower chamber is quite large and prone to sticking, so some shots hit the valve harder than others. This reduces the Autococker's accuracy considerably. The rear trigger frame screw is drilled out to allow for a barb to be installed into the ram in the lower tube, requiring permanent modification to the marker. The Osiris uses the beaver tail screw hole for mounting the tray to the body of the marker and then has the frame screw into the tray.
Conclusion: Compared to the mQ valve that was released a while after the Osiris or even just a standard hammer/sear setup, I don't really understand why anyone would want an Osiris. There's quite a contingent of people that feel that the Osiris is the greatest thing since sliced bread. Quite frankly, it isn't. The mQ is vastly lighter and far more accurate and allows for the same insane cycle speeds. A regular hammer/sear setup might be a bit slower, but I'll take the better accuracy and reliability any day of the Osiris.

The Osiris does at least work, so I give it a 5. I gladly sold mine to someone else and moved on.
5 out of 10

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