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As far as I can tell, you've covered all the bases... when I come across a gremlin like that, the only recourse I have, is to get a bone stock gun that is known to function 100%, and slowly upgrade and test it one part at a time from your "upgraded" gun, and see which part is the offender.
I've had a couple guns come in to me with this "Teflon mod" to the hop up rubber now, and I've found in all cases, that it actually depreciated the performance output in the form of inconsistent and lower FPS.
I'm not sure if the proponents of such modification technique ever bother to test this modification empirically.
Further, I recently had a gun come in, where the user had teflon taped EVERYTHING in the gun, including the inner barrel (where it contacts the outer barrel), hop up rubber, fill valves and the output valves. This resulted in the following issues:
- Inconsistent and low FPS (220fps)
- Inconsistent to non-existent hop up effect
- Worn slide lugs due to restriction of movement between the inner barrel and outer barrel
- Worn chamber lugs due to restriction of movement between the inner barrel and outer barrel
- Complete fouling of all internal mechanisms related to gas flow due to the pieces of Teflon tape breaking free from the valves and smearing themselves through the internals. After removing all the tape from the valves, I filled the magazine again, and found no leaks. Why the user taped these valves - I have no idea. It offered no benefit.
:P
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