S length. Confident you will need some force, but this is because of The point that the quick alter buckle is held in place by friction. This could be the weak point to a person but I have discovered this to become of no issues for me, the sling hasn't https://magpul-rvg21718.dsiblogger.com/67718870/a-review-of-4-30-round-m2-30-cal-magazine-s