Kl4 fits snugly but still useable. Follow up to what I said before; the McE2S switch is the same diameter as the A2 head and it does fit in the pouch fine. Because of the flanges it doesnt slide in as smoothly. My pouch is fairly new and I have only had the L4 and A2 in it(head up). I dont think you would have any problems with any of the configurations you mentioned.