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I have managed to manufacture a solution to my issue by shimming the mag catch on the magazine with 1mm of extra material, and sloped the BB catch in the mag just slightly to reduce the resistance when it's being pushed by the hop-unit. The shimming allows it to sit just slightly taller into the hop-unit which neutralises the feeding issue. It could perhaps mean that my RPK-74M is a bit of a lemon and that mag catch is cut just slightly too short despite it having no issues feeding from LCT own mags or CYMA mags. It's a tedious fix to have to modify 10 mags, but a fix nontheless. No such thing as milspec when it comes to AKs I suppose aha.

Interesting now that you ask. I bought them advertised as 180rnds, but never really counted untill now. I only get 130 rnds into the mag

I'm under the impression I am using the gen2 mags? These being the ones with a shine finish and completely captive. From old review videos of the mags they appear to be a matt finish and able to be dissasembled. When I bought from them from Airsoft World, they were advertised as the *new* type which came after lockdown. I had bought 10 of these, but they all have the same issue for me, so it's not just the one mag being a lemon. They were also bought a while ago so I'm committed to owning them haha. I presume you had stock LCT hop-units in both your RPK and 105 when you used them?

Does anyone here have any experience with the TWI Molot mags? I've have no end of headaches getting the things to feed with my LCT RPK-74. From my own observations, it seems like the BB catch on the mag has too shallow of a ramp that contacts with the hop-unit, meaning when the mag is seated in the magwell the hop-unit isn't able to push the catch out of the way to allow BBs to feed into the unit. I've made some attempt to add more of a ramp to the catch, but the hop-unit still struggles to keep the catch back. Which makes it seem like the hop-unit is too short for the hole in the mag. Just wondering if anyone else has experience something similar, if they have found a way to over come this sort of issue.