I'm looking for a simple natural rubber, high quality strap for my 556. Probably constant width 20x20. Something along the style of these Bonetto Cinturini straps:
Model 320 (too thin? yes, only 2mm):
Model 306 (too thick? maybe, but it tapers right away to 18mm):
Any first hand experience with the above? Thoughts? Other recommendations? Photos of the rubber you are using on your 556?