S length. Guaranteed you will need some force, but this is because of the fact that the quick alter buckle is held set up by friction. This could possibly be the weak point to somebody but I have found this to get of no difficulties for me, the sling hasn't https://smith-wesson-m-p-15-22-ma75296.pages10.com/smith-wesson-m-p-15-22-magazine-options-68855097