When you're a left-handed shooter shooting right-handed AR's you can tell even non-suppressed. It forces it downward (radian type sd)into the lower unlike the pri that has a channel to move it out the handle only 1 direction
Radian sd/sl
PRI gas buster
Those are the only 2 I know of. I do have several of the radian's and maybe 2 pri's. As far as gas goes I'm a lefty shooting right-handed rifles/ar's so I haven't noticed any blowback. 8" is the shortest pcc i have and 8.5" in rifle cartridges.
Might be a @HayesGreener question or someone from VA that could answer about VA that lives there. No carry-on, but will be a checked luggage. Keep it unloaded and firearm case locked. Not sure about check points on what to do
I was reading that thread on the other forum and I'd suggest seeing what's available powder wise according to what data provides per manufacturer for 32h&r