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I have been told there are mods to the receiver/trunnion when the adapter is installed,turned me off on buying one
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The piece of metal in the magwell on the front trunnion that standard AK mags lock into is milled/sanded off on the M85NP in order to proper load PMAGs and USGI mags with the poly magwell.
It can be removed obviously but there isn't much info online about it since most people who purchased the M85 aren't going to be tinkerers.
If you do remove the plastic magwell and plan to use metal mags, you will need to send it off to a smith and get the mag catch/latch re-welded onto the front trunnion OR have a completely new unmodified trunnion installed.
If you do that there is an added benefit...moving away from a 22mm trunnion and into a 23mm which has more barrel sizes available like the bulgy 5.56 barrels from KVAR.
But obviously if you do all of this you are putting lots o' money into the rifle so it's up to you.
I love my M85. I put 110 rounds through it today and it functioned flawlessly and was more fun that my ARs to shoot!
Then again- I have no need or want in my life to use metal AK mags or purchase them.