the extension is only 3" which is really not all that much. it does make it BYF with only the hammer hitting and impact noise. but after two clips, the noise starts to pick up, only because of more air being used each shot.
adding a TKO either to the shroud, which one is made to screw into the shroud or even putting it on the barrel, that will make it longer than the JG shroud extension.
Now using your legal, 22lr, I'm not up on the regs, but I'm under the empression that if its regestered, its regestered to one gun and only one gun.
I told you in a pm that my AA 400 had 2 holes in the shroud, which were 1/8" and not the 5/64" , not sure if larger holes in the shroud would help or not. I have yet drilled any , but I purchased both 5/64 & 1/8" bits to make the holes in my shroud.
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one step closer to the ultimate goal