The thread all depends on the weapon. The 1/2 x 28tpi is pretty much a standard, due to the popularity of the AR15/M16 platform, but MACs, for example, have a much courser, steeper thread. Many modern suppressors use a quick detach feature via a proprietary flashider, which replaced the stock unit. Others fit over the existing flashider and the MP5 series uses a unique, three lug system.
Those soda bottle adapters were disallowed by ATF and any similar adapter must now be registered. While they were around, you could place a quart sized soda bottle filled with styrofoam peanuts onto an AR15 with a .22 caliber conversion unit and have a really effective suppressor. They would last until you decided to throw the bottle away.
BTW, I'VE HEARD that a standard, quart-sized soda bottle will fit right onto a birdcage AR flashider with NO adapter necessary, (especially the early three pronged type) and will work just as described above with a .22 platform.
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