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All Springer/NP/PCP Air Gun Discussion General > BB Guns and Such

O-ring to prevent Model 25 shot tube from vibrating loose?

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airgunaut:
What size o-ring fits the Daisy Model 25 shot tube's threaded end--the silver internal one, not the black one at the muzzle?

Firing the gun eventually causes the threads to partly unscrew, and the shots lose accuracy. I bet it is simply vibration induced and would like to cushion that end of the tube with an o-ring. Better than repeatedly tightening the muzzle cap. The loosening happens even by the time 30 BBs have been fired, sometimes earlier than that.

If someone has done this, what size o-ring works?

Roadworthy:
I've not done this but you could consider Vibra - Tite VC-3 if you disassemble it from time to time or blue Loctite on the threads if you rarely take it apart.

bantam5s:
I have tried this before,  but took it off for some reason that I can't remember.
I think maybe it caused my shot tube to get stuck or something.

I could tell you which size to use, because I just grabbed one from my assortment that fits.

airgunaut:
What size o-ring is that, David? I hate to really crank down when tightening the thing. I did that and one time it held the position, but another time it loosened anyway.

Back to checking/retightening it every 10 shots!

airgunaut:

--- Quote from: Roadworthy on April 15, 2025, 02:44:01 PM ---I've not done this but you could consider Vibra - Tite VC-3 if you disassemble it from time to time or blue Loctite on the threads if you rarely take it apart.

--- End quote ---

These threads are exposed and the shot tube assembly is removed and reinstalled every time that BBs are loaded. Are we talking about the same model of gun?

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