Comments by "bakters" (@bakters) on "wz.96 Beryl: Poland's 5.56mm Military AK" video.
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@lukas1392 "DeserTech MDR. They look almost identical (on the outside)"
The basic idea of a 7.62 bullpup makes them look similar, but MDR looks like a "quick hack" and a clever prototype in comparison to Grot. That's only my not particularly qualified opinion, but MDR has so many, tiny, little, bolts holding it together, that it's hard to not go there. You don't expect to need several different allen keys in order to disassemble a rifle any more...
Also, the ejection system in MDR falls dangerously close toward "too clever" engineering fallacy. A bunch of tiny little parts, which need to fit each other just right in order to work, for not that much gain. Switching Grot from left to right ejection is very quick. You could do it out in the field, no need to go to the armory. Making the operation slightly smoother at the cost of complex, experimental design seems like a risky bet.
The action itself differs. Grot is based on AR18, MDR on a modified AR15. Modified quite a lot. Again, a risky bet, but I suspect that in this case it's a winner. Meaning, it could be made to work in military environment, despite containing more tiny, easy to lose parts, but it's still no advantage over Grot, which does already work in the military environment. (Also, the bolt on MDR seems rather light for what it's asked to do. Chambering a round in addition to "chambering" an empty case and such a low mass thing to do it all? Maybe. I'm not an engineer. Who knows?)
Six settings on the gas system, easy to adjust with the tip of the round, after you take off the handguard, which requires an allen key...
Sorry, I stop here. MDR is not a military rifle, MSBS Grot is. Compare like with like. MDR to some other civilian rifles in similar price range, Grot to some other military rifles which serve the same purpose.
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