So I do a lot of testing of adapters while making new ones and often have it set way too tight to see if an adapter is working or if it’s worth refining to get it working nicer.
when running it as a player I back the nut off till it’s just finger tight. Pop a mag in, ‘fill’ the mag, probably get about 5bbs in. Then tighten a little, ‘fill’, count bbs, repeat. To get the best life out of the feed cog you want it only just filling the mags. Any more tension than that and you’re putting unnecessary pressure on the cog. You want it turning freely with a full mag not clanking or just stopping.