SBR Question

[RCCrawler]

Yes, any caliber, any barrel length.

O2

If this is true why do they ask for specific barrel lengths and specific calibers?

[275RLTW]

You only have to report permanent changes to the original reported configuration.

[O2HeN2]

If this is true why do they ask for specific barrel lengths and specific calibers?

Don't shoot the messenger, it's the ATF's rules. You have to list the configuration that you're making, you can't just make a generic SBR lower (no matter how much sense that would make). As someone mentioned, keep the original upper around, otherwise it's a permanent change which isn't a big deal, you just have to file paperwork declaring the change.

O2