Read the AW Registration Guide. It answers all of your questions and more.
No tax stamp, you're probably thinking of NFA weapons (Short-Barrel Rifles, Any Other Weapons, etc), which doesn't apply to your AR pistol unless you plan to put a forward pistol grip or a buttstock on it.
The only cost is the $15 per person, per application (you can put unlimited firearms on a single application and only pay the $15 once)
The guide will explain everything you need to know. Your 80% pistol will need a serial number engraved on it, which you'll need to obtain from DOJ (even if you've already applied your own serial number to it). I'd request that serial ASAP... Register the rifles while you wait for your pistol serial to arrive, otherwise you risk running out of time, the clock is ticking. Again, all this is explained in the guide.
No tax stamp, you're probably thinking of NFA weapons (Short-Barrel Rifles, Any Other Weapons, etc), which doesn't apply to your AR pistol unless you plan to put a forward pistol grip or a buttstock on it.
The only cost is the $15 per person, per application (you can put unlimited firearms on a single application and only pay the $15 once)
The guide will explain everything you need to know. Your 80% pistol will need a serial number engraved on it, which you'll need to obtain from DOJ (even if you've already applied your own serial number to it). I'd request that serial ASAP... Register the rifles while you wait for your pistol serial to arrive, otherwise you risk running out of time, the clock is ticking. Again, all this is explained in the guide.


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