S size. Guaranteed you need some force, but this is because of The reality that the quick modify buckle is held set up by friction. This may very well be the weak point to someone but I have found this to generally be of no troubles for me, the sling https://bulldogbeltslideholsterbl64185.diowebhost.com/89639417/5-simple-statements-about-full-rail-1-7-twist-explained