Semi setup
Pump parts
bolt & striker
Complete setup, left side
Complete setup, right side
Got tired of not having a pump to play with so I made my own
Parts:
aluminum rods from a rifle cleaning kit
small piece of metal to connect the bolt to the pump arm assembly
pvc pipe connector
3/4 dia spring for pump return
lotsa time
Take the pvc connector and drill 2 holes on the very end. Cut the aluminum rods to size at the threaded end and SAVE the pieces you took off. Tap the pvc piece and thread the new end of the rods and screw em in. Tap the back of the bolt to accept a screw (I used 8/32 threaded screws since thats what the pump arms were). Fab up a piece of metal with 3 holes in it to connect your pump arms to the bolt.
Next, take your striker and start grinding a channel into it IN FRONT of the old striker hole and be careful to keep the slot as narrow as possible to avoid the spring bending outof the slot. Take that old piece you chopped off the pump arms and slap a cup seal on it and trim it down until its about a quarter of an inch longer than a stock valve pin.
Remove the stock ball detent and striker buffer. Put your new longer valve pin in. Assemble the bolt/striker with the pin in the new slot ya made. Slide the pump arm over the barrel and screw the pump arm assembly to the bolt.
Take the new spring for the pump arm and slide it in behind the bolt and slap the back block on and voila, new spyder pump!
The beauty of this mod is it can still shoot in semi mode again, just take all the parts off and put the detent, old valve pin and striker buffer back in the original hole.
Yes it works as a pump and back in semi mode. I used the same springs in both configurations (hard valve, light or med main). All I had to do to adjust the velocity in the different modes is adjust the reg.
Pump parts
bolt & striker
Complete setup, left side
Complete setup, right side
Got tired of not having a pump to play with so I made my own
Parts:
aluminum rods from a rifle cleaning kit
small piece of metal to connect the bolt to the pump arm assembly
pvc pipe connector
3/4 dia spring for pump return
lotsa time
Take the pvc connector and drill 2 holes on the very end. Cut the aluminum rods to size at the threaded end and SAVE the pieces you took off. Tap the pvc piece and thread the new end of the rods and screw em in. Tap the back of the bolt to accept a screw (I used 8/32 threaded screws since thats what the pump arms were). Fab up a piece of metal with 3 holes in it to connect your pump arms to the bolt.
Next, take your striker and start grinding a channel into it IN FRONT of the old striker hole and be careful to keep the slot as narrow as possible to avoid the spring bending outof the slot. Take that old piece you chopped off the pump arms and slap a cup seal on it and trim it down until its about a quarter of an inch longer than a stock valve pin.
Remove the stock ball detent and striker buffer. Put your new longer valve pin in. Assemble the bolt/striker with the pin in the new slot ya made. Slide the pump arm over the barrel and screw the pump arm assembly to the bolt.
Take the new spring for the pump arm and slide it in behind the bolt and slap the back block on and voila, new spyder pump!
The beauty of this mod is it can still shoot in semi mode again, just take all the parts off and put the detent, old valve pin and striker buffer back in the original hole.
Yes it works as a pump and back in semi mode. I used the same springs in both configurations (hard valve, light or med main). All I had to do to adjust the velocity in the different modes is adjust the reg.
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