I can see why he would want to wear gloves to protect his hands from the heat coming off those guns. especially with the bump fire system I saw on at least one of them. Just a couple 30 round mag dumps can really get those barrels hot and it looks like he had several 100 round magazines. so those things would be smoking after just two mags. Probably why he had several guns because he thought he'd burn up a few barrels after bump firing hundreds of rounds through each gun.