Just need an approved form 1 to build a suppressor as long as your state allows them.
I have built several. Like stated above check out silencertalk.com they have a lot of useful information on there. Do a lot of research before you decide on your design. Remember once you have built your suppressor it is done. You can't go back and change it if you don't like how it works.
I used k baffles in all of the ones I build. If you want a suppressor for your 300 whisper you can build it out of aluminum or stainless. I would build the blast baffle out of stainless and the rest of your baffles out of aluminum and use aluminum for the tube.
Another thought is to buy a 308 or 9mm suppressor for your 300 whisper. It all depends on how handy you are with tools and what you have access to.
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