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You can use whatever upper you like on the registered lower so long as the barrel is the same or longer than what was registered. As an example, you can't register as an 11.5" 556 and then put on a 10.5" 300blk. Always register the weapon with he shortest barrel you plan on using.
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That is perfectly fine. Once your approved form comes back and you build your rifle you are aloud to change configurations/caliber and have no need to notify the ATF you have done so. As long as the barrel is engraved with the caliber you don't need to engrave any caliber on the lower itself.
You can use whatever upper you like on the registered lower so long as the barrel is the same or longer than what was registered. As an example, you can't register as an 11.5" 556 and then put on a 10.5" 300blk. Always register the weapon with he shortest barrel you plan on using.
Where do you people come up with this garbage? Seriously, I want to know.
OP, literally nothing that guy said is correct.
1. Register the gun as it will initially be built.
2. Don't engrave the caliber anywhere, the barrel will be engraved with caliber from the manufacturer.
3. Put any caliber or length barrel you want on it after that. Nothing is required. You don't have to tell the ATF that you're changing it. They don't care.