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Smart Parts

Product testing performed with DraXxus Paintballs

Testing Performed at Hurricane Paintball Park

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By Bill Mills - Photos by Dawn Mills - Apr 2006


Overview - How It Works - Disassembly - Testing - Raw Test Data

Field stripping the SP-8 is basically limited to pulling the barrel and foregrip for cleaning.  While only the muzzle is normally exposed, the SP-8s barrel is removed just like that of most paintguns, it unscrews and then slides forward out of the foregrip. 

A single push-pin locks the foregrip in position.  The pin is friction fit with a small o-ring to keep it from falling out.  A stick, screwdriver or hex wrench can be used to press the pin out, allowing the foregrip to slide off to the front. 

Disassembling the SP-8 much further is a task for the staging area, or the workbench.  It starts with unloading and degassing the marker. 

Another push-pin holds the butt-cap on the back of the receiver.  Sliding this out and removing the butt-cap leaves the grip frame screws connecting the grip frame and upper receiver. 

One screw is located at the back of the grip frame and the other lies just forward of the trigger.  They are removed with a hex wrench.  It is important to note that the rear screw is longer than the front screw.  The receiver can then be lifted away from the grip frame.  As with the ion, the wiring harness of the Vision eye, and the gas fittings to the fire chamber, front body breech and circuit board will keep the receiver and grip frame from coming far apart. 

A hex wrench is then used to remove the two banjo bolt air fittings from the front body breech and the swivel donut on the back of the fire chamber. 

Because these are banjo style elbows, their centers pivot, so they can be unscrewed without having to twist the hoses to which they are connected.

The Vision cable is easily removed from the vision circuit board taking care to remove the plug, not just tug on the wires, as this can eventually yank them out of the plug.  A small o-ring pick or similar tool can help with this operation. 

The metal receiver consisting of the fire chamber and front body breech can then be slid out the front of the upper receiver.  The Vision circuit board, located in the bottom of the front body breech might cause a problem here.  If it slides just a little bit out of place, it can catch on the upper receiver, so it is important not to force the inner receiver out if it feels like it is not sliding readily.  It is imperative to make sure the vision board is seated all the way in the front body breech and not catching on the upper receiver.

With the internal metal receiver free, it is easy to see that the SP-8 is so much an Ion on the inside.  The fire chamber is the same, and the swivel donut and front body breech are nearly identical.  The swivel donut on the back, which is what feeds air to the fire chamber, while swiveling to account for thread alignment on the front of the fire chamber is more rectangular than that of the Ion, in order to fit properly in the upper body receiver. 

The front body breech is not threaded for a feedneck, because the SP-8s feedneck is held in place by the upper receiver.  Also its exterior texture is smooth rather than matte like the Ions other than that it is Ion style.  The fire chamber itself is interchangeable with that of an Ion and even shares the same part number.

It is easy to lift out the C-shaped Vision eye board from the front body breech for cleaning and inspection.  The rubber nubbin style ball detents can also be similarly removed for cleaning or replacement if needed.

Only hand strength is needed to unscrew the front body breech from the fire chamber.  This allows the bolt and bolt stop to be pulled out so their seals can be cleaned, lubricated and inspected. 

In case of a leak at the swivel donut, a pair of snap ring pliers can be used to remove the snap ring and slide the swivel donut off the fire chamber.  After cleaning and inspection of the seals, all of the seals should be very lightly lubricated before reassembly.  Smart Parts recommends Sl33k, their brand of pneumatic lubricating grease, for all weather operation.

If necessary for cleaning, the upper receiver halves can be taken apart by removing the top sight rail, two Phillips head screws and sliding the round activator forward.  Once apart, the feedneck can be removed from the upper receiver.  It should be noted that the feedneck extends over 1.8 inches out of the upper receiver.  Because it is a separate piece it can be cut down to a shorter length for lower profile with feeders like the Q-Loader or Warp Feed, and if a return to the original length is desired it can be replaced, without having to replace the entire upper receiver half.

The feedneck is locked quite securely into the receiver half, but easily unlocks by rotating it 180 degrees (this can not happen when the SP-8 is assembled because the body breech fits up to the feedneck, preventing rotation.)
All of the components from inside the upper receiver are reassembled in the reverse of the disassembly procedure, and the grip frame is reinstalled to the upper receiver the same way.

While the receiver is off the grip frame the SP-8s circuit board can be slid out of the top of the grip.  This first requires removal of the banjo bolt on the top of the vertical adaptor (the magazine area of the grip frame.)  Because of the size of the solenoid valve used, it can be cleaned and checked with relative ease compared to the miniscule valves found in most electropneumatic paintball guns. 

A metal bracket holds the solenoid together, and is clipped in place by spring tension.  Care must be taken when removing the clip, not to damage the exposed wires of the solenoid coil.  A small hex wrench or tweaker can be used to pry between the clip and the section of black plastic coil frame at the top of the solenoid. 

With the clip removed, the head of the solenoid can be removed and the core slides easily out of the coil.  When reassembling the solenoid, its head must be oriented correctly.  The two hose barbs on the head are not perfectly aligned, they form a slight angle.  This angle should point, like an arrow, toward the right side of the grip frame when the circuit board is in place. 

Smart Parts has color coded the hoses used in the SP-8 to make reassembly even easier.  The two blue hoses are under constant pressure the gas feeding from the vertical regulator to the solenoid valve and from the solenoid valve back to the swivel donut.  The clear hose runs from the solenoid valve to the front body breech, and its gas supply is switched off and on by the solenoid valve.  It is also identified by a small rubber band keeping the Vision wiring harness bundled to it.

Continue to Testing

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