First, you obtain a Type 7 or Type 10 Federal Firearms License and a Class 2 Special Occupational Tax stamp, at which point you'll be properly licenced to manufacture a suppressor.
Otherwise, you find a Class III firearms dealer, fill out the appropriate paperwork, pay the BATFE transfer tax, and buy one.
Those are the only legal ways to go about it, and how-to guides for performing illegal acts are not given on this site.
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