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Rogue-9 Bearing-Delayed Receiver Mod (forum.guncadindex.com)
submitted 4 months ago by to c/general@forum.guncadindex.com
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Documentation file complete. Going to test it and then if it works send it off to sail. Uses two spring loaded plungers installed into the side of the receiver using JB Weld'd threaded inserts. Any one see why this might not work?

-- sleepy echidna

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[–] 1 point 4 months ago (7 children)

Does this implement an actual bearing-delay mechanism to provide temporary lockup or are the plungers just introducing extra friction at the closed bolt position?

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  • [–] [S] 2 points 4 months ago* (last edited 4 months ago) (6 children)

    The bolt has to overcome the resistance of the bearings and push them into their recesses. This delay will hopefully reduce the amount of gasses escaping from the breech. This is also what the "Scropion Evo Gen 2" drop-in receiver does and that has been very popular (recoil impulse and suppression improved). That's also just two spring loaded bearings working against the bolt. By comparison, it's not as intricate as something like the "Mean Arms Bearing Delay" which has a mechanical disadvantage by pushing a shaft/bolt out of the way before the bolt carrier can move.

    I read on a random comment somewhere that the Urutau developer was trying to implement a delayed action. Is anyone aware of work in this area? The null-22 developer also has a video working on a delayed blowback mechanism that features more of a mechanical disavantage design, but it looks like it relies on a lot of plastic on plastic in the bolt.

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  • [–] 1 point 4 months ago (4 children)

    Are you familiar with the Bobcat by AWCY? I think that bearing-delayed mechanism is fascinating, and I feel like its design could be adapted to the Partisan 9 and Urutau relatively easily.

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  • [–] [S] 4 points 4 months ago (3 children)

    That's a cool build, thanks for sharing. The AR bolt carrier group for the mechanical disadvantage is metal on metal. No idea how someone would create the same using DIY methods.

    Builds that need firearm parts are kind of retarded. Euro's and Anglo colonies need this full DIY shit more than Americans need another thousand printed shells for firearm hardware

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  • [–] 2 points 4 months ago (1 child)

    hahaha，you are right.I am in china so only diy design is useful for me.But it is not mean that printable frame and recivers are useless,I believe there is no such thing as a useless innovation; every design in the 3D-printed firearms community offers some form of inspiration. Builders in the US, where gun regulations are lax, prioritize safety and reliability, which is why many hybrid designs incorporate quite a few factory firearm parts. Of course, since we are in a strictly regulated region, we can reference those designs that require standard gun parts and modify them to fit our constraints—just like how Derwood's AP9 design inspired JStark's FGC-9.

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