Titanmax
Member
I have recently received approval from the ATF for an AR-15 SBR. I understand the 29" OAL rule but have a few questions.
- Does a 10.5" barrel chambered in 5.56 need to be marked, or advertised, as HBAR? Can't say I've ever seen one marked as such.
- Can I change out the upper to other calibers, say 300Blackout or .22LR, without filing additional paperwork with the ATF? Keeping it over 29" of course.
- Can I install a verticle forgrip on a SBR that is 29" OAL