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I'm trying to find a middle ground where I get the choice of velocity of using a muzzle can but the handier short length of an integral (not to mention the visual appeal of an integral). I would like the bolt to cycle on Remington Subsonic which I have a fair bit of. I don't think there is any 40gr loads that will go super sonic in a 5 1/2 inch barrel anyway, although I could be wrong.
If all goes according to plan, I would have a pistol that is maybe an inch or two longer than the Amphibian, a little louder, and a flatter trajectory.
The barrel porting location is rather important to final results. The Amphibian starts way back at the chamber (just about) and has the barrel much shortened. I want to be closer to the muzzle end with a longer barrel. The ports want to vent into a chamber so that as the bullet reaches the muzzle, it is still under just enough pressure to overcome bearing friction.
The portion of the suppressor ahead of the muzzle would resemble a shortened version of a traditional can.
Also the suppressor will be threaded for takedown. The Amphibian is sealed. I don't know how long it takes to lead up. But it will happen eventually. I expect that the location and size of the ports keeps them from accumulating lead for a while though.
A final word on velocity. The ideal is near 1000 fps. This keeps you shy of the transonic range so that bullet flight noise doesn't become a problem. It also gives you somewhat more "point blank range" than 800 fps will which is about the best the Amphibian will do with fairly hot ammunition. Going lighter than 40 gr just makes things worse because you lose ballistic coefficient.
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