AR-9 building question - roll pins

One of my 9 mm carbines is the Colt 6951, it is the rifle used at the elite Rogers Shooting School. List of pins.
Fabricated a delrin vise block for bench top tinkering.

dave_the_swede said:

I found that CMMG makes the parts I needed, but the kit I got did not come with roll pins for the ejector or the feed ramp.

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An AR9 made on a Mil-Spec AR-15 lower will have the ejector and feed ramp on the magazine adapter. Therefore, most LPKs do not have such parts.

If you plan to use a special lower that takes a pistol caliber magazine, you'll have to source the hardware to mount the ejector, as well as the ejector itself, from the maker of the lower. They are not standardized.

I cannot quite see how a roll pin would be useful to fasten an ejector. I suppose if your design has a slot into which ejector is inserted, then it may be possible. But in most cases screws are utilized. Or rivets, for factory completions.

If you find an extra roll pin then you have to build another AR. That’s the rule.