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Stalker's bang on. I'd add just a point or two that may help you out down the road...
- since different makes of springs come in different lengths, thicknesses of wiring, etc....you need to make sure that you're setup has enough space to fully compress that spring...especially if you have a bearing spring guide and a bearing piston head.
To test it before you install everything do the following on a solid table/desk.
- put the spring guide on the table, point up
- put the spring over it (tighter coils of a non-linear spring go at the spring guide end...but it doesn't matter for this test)
- put the piston body/piston head assembly over top of the spring
- carefully (you'll probably have to hold the spring guide so it doesn't slip out of position) press the piston assembly all the way down. Although it doesn't go all the way flush to the end of the spring guide when it shoots...it's pretty close to it.
- obviously...let the piston up slowly when you're decompressing the spring and don't put your face over top of it! LOL!
Things to watch for:
1. The end of the piston actually fits over then end of the spring guide bearings...I've had a spring guide/piston combo or two where the piston would jam on the bearing set. It' might be a close fit...but the piston should freely go over the spring guide bearing/washers.
2. The end of the spring is a good fit and sits completely on the spring guide bearing/washers...if the end of the spring is a little too big...when under compression it'll squeeze out wider than the spring guide and will jam the piston. I'm not 100% certain this is always the case...but several stock CA springs that I have will jam up a setup with a modify bearing spring guide.
3. If you can't push the piston assembly all the way down with a given spring...swap out something (most likely the spring) so it does...if not your going to either lock up your mechbox or strip something.
Best of luck,
Tys
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