the rail is ventilated and came w/free rail covers the heat is not noticeable the rail was only like 60 bux i have had it on the rifle for 2 years and no loss of zero on the optic i would recomend it to any one. the bag is awesome i got it from cheaper than dirt for like 40 bux it has mole atc and 3 pouches that attach to the mole straps the center pouch has room for 10 30rnd mags and the other 2 can hold plenty of cleaning and other stuff it also has a zippered section that will hold 2 hand guns in seprate padded compartments .ilike this bag a lot and will get one for my new vector uzi also.