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to clear up any confusion, these M4 stocks WILL fit an M1 by removing the metal sling keeper in the stock. pictured is one of two M1s ive put these stocks on over the years

Is this the newer manufacture or the older release? I can't answer for certain as both of mine are the older HK era and have extended magazines which utilize a snap-ring keeper instead of an actual cap. But, I would imagine the caps from the same era would fit. I do know that on other aspects such as the stock retaining nuts, and magazine threads they did change threads between the older guns and the newer on guns some models. Ask around of people in the area. I highly doubt an Ethos or Montefeltro cap will work, but if it's an older one, you might try a friends Super Black Eagle or M1 to see if they work. If it is of the newer type, then see if a newer M2, Super Black Eagle, or even M4 might work. That is an easy enough part to try that get on a few local gun and hunting forums in your area, I'd imagine someone would let you bring your gun over and try. Once you know, then you know what to cross-reference it to. I didn't have any luck when I looked at Numrich and others as they showed the extended mag with no cap also. I did find this listing for an aftermarket part that says it works with several, but doesn't differentiate anything about new or old and does list many of the models I listed above: https://www.gunbroker.com/item/1093125329 If you absolutely can't find anything, perhaps this would be a good time to add an extended magazine to it (you can still use a limiter to make it legal for applicable seasons). Just note that there are also at least two thread types for those. Good luck on your quest.