Hi Timmy and welcome. Your local FFL Dealer is your best route for submission of SBR paperwork. Just enter your Zip Code and proximity here to locate one : budsgunshop.com/ffl.php ---------- Cheers, stay safe and enjoy the build!

Some sites like silencershop offer services for helping fill out and track the progress of form 1 submissions and they may have kiosks at dealers in your area that make the fingerprint process simpler. Also, possessing all parts of an SBR without having the tax stamp yet is what the ATF might call "constructive possession". Here's a link to silencershop's option: silencershop.com/services/atf-form-1-service.html

Hi Timmy, Your transferring FFL will usually assist you with the filing of ATF Form 5320.4, also known as the “Form 4.” This form is required in order to transfer the NFA item from the receiving FFL to you.
You can fins a local FFL here by putting in your zip code budsgunshop.com/ffl.php ,
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NFA Guidelines here budsgunshop.com/nfaguidelines.pdf ,
Stay safe & have a great day!