The huma ones are Jeff’s design. I think he sold the idea to them maybe? It’s leaps and bounds better than the donnyfl version.A number of people make the adapters. I believe that Huma makes them, as does DonnyFL. Geoff from Sub12Airgunners in the UK also makes them and that’s where I got mine. I have them in .22, .25 and .30 and they work perfectly. Try messaging Jeffman here on AGN.
Chris
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