Here are some of the photos I have taken or collected to show the differences in links. I have stolen shamelessly from other posts with the link data drawings. Last photo shows the MK II 303 link on the right and the 30 cal M1 link on the left. Not all "M1" links are marked. there were a number of foreign makers. the "DAQ" marked ones are 30 cal from Dominion Arsenal in Canada. I had /have thousands of these as they came on M1909 blanks we bought back in the dark ages. These were a hoot to fire in an enclosed garage with the lights out. These have been passed of by some as the 303 links, but they will not work. There are unmarked, glossy, gray/green ones that are from sealed tins, 120 rd belts of Korean ammo.
This should all be collected up and placed in a sticky - we go through this on one board or another just about once a month. I know other guys have a lot of additional info.
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