had one for a while now, good pack with usefull pockets and straps for various set up options.
I think they quote 36"? but in reality my set up is 34" and is a bit of a tight squeeze, expecially at the barrel end if you have a bipod mounted.
first one I had, had an iffy zip that would occasionally 'come of the rails' so to speak, but was soon changed for another and no problems since
hope that helps?