I’ve bought two different carbines over the years for keeping in the vehicle whilst traveling on vacation. The first was a 10” AR with a brace/stock in 556 and the second was a Ruger PCC 9mm. The Ruger comes apart so it’s easy to put in a backpack to disguise it but the AR has much better range and more muzzle energy however the 556 is so loud from a 10” barrel that it’s very uncomfortable to shoot even with hearing protection. I’d still rather carry the AR and have swapped the barrel to a .300 blackout which toned down the muzzle report drastically but is still a longer, harder to hide than the Ruger. Wondering what others tote for trips and why.