I'm getting ready to do my paperwork to SBR a lower. My questions are
1. If I file for a 10.5 inch 5.56 barrel, can I put any length I want afterwords as long as it's at least 10.5 inches.
2. If I want to add other calibers (I.e. 300blk 22lr), as long as I list them on my form can I use...