GTA
All Springer/NP/PCP Air Gun Discussion General => PCP/CO2/HPA Air Gun Gates "The Darkside" => Topic started by: nattydreadlocks1973 on February 14, 2017, 06:16:44 PM
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I went to a machine shop and had them make me a PCP air tube. The tube is made out of 4130 chromoly. It has a wall thickness of .65. It is good too 3000 psi. The only problem is The Machinist made it a little too short for my tastes. The overall length of the tube is 16-1/2".This includes the fill nipple and the end cap. I was making this for a QB. As it stands, it is a little longer then the standard length of a QB tube. I have not put the holes and slots in the receiver end.I was thinking of putting it ebay. How much should I ask for it?
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Considering what you paid for it, come up with a price YOU would be okay letting it go for.
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Here is the tube pic...
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So it still needs additional machining to be installed on a QB ??
To be honest, its more or less worthless in that case unless the person buying it has machinery , and if they did ,they would simply make their own..
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Might make a nice .25 pistol project with a "big bore" top end & P-rod grip frame/trigger from Baker Airguns (formerly Bryan & Associates) ;D
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Might make a nice .25 pistol project with a "big bore" top end & P-rod grip frame/trigger from Baker Airguns (formerly Bryan & Associates) ;D
In which case, you could just get a pre-made tube and parts from crosman (prod/1720T: 16")
I agree with Rob, not much value unless it was fully machined for a particular gun.
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I listed it. Let us see what happens. It's worth something. The fill nipple and endcap cost me about $30. The tube cost me about $20. Tack on another $20 for the machine work. I don't know about you guys but for me, half the fun of air gunning is modifying things. Turning nothing into something and shooting the center out targets, to my friends dismay, is sweet music to my ears. The tubes were cut to short for my tastes. Let me walk you guys through the steps.
1. Apply layout dye to the tube.
2. Using a $60 el-cheapo cross vice, tram the vice then secure the tube in the vice.
3. Using the jaws of the vice as a guide, scribe a centerline on the tube.
4. Using a drill bit and a end-mill held in the chuck of a drill press, drill all holes and cut all slots. Threading holes are as easy as drill and tap.
* If a hole is to go through both sides of the tube, drill straight through the tube in one shot.
* when you rotate the tube 180 to cut the other side, without removing the drill bit, use the holes as your reference point to ensure that you have rotated the tube 180.