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The carbine and rifle configurations weren't of much importance, as they had M16s and CAR15s, but the beltfed LMG was very useful and very liked. It was a bit maintenance needy, and probably it could have been a better gun if they had dropped the multi configuration stuff early and instead focused on developing it solely as a SAW, but still it did pretty admirably.
In the machinegun configurations, it's remarkably easy and steady in its recoil, maintaining a sight picture during a long burst is trivial, part of this is probably some of the efforts to buffer/dampen the bolt going back and forth, the bolt carrier itself containing a setup with an array of Belleville washers which compress as it comes to the rear of the receiver, then flex back, along with the piston having a sliding tungsten rod inside of it, giving a sort of deadblow effect.
It uses a long-stroke piston, like an AKM, but a rotating bolt with radial lugs like the AR15 and AR18, built with a stamped steel body and plastic furniture.
Pictured here loaded with a belt of dummy cartridges, feed cover up. There was a setup for a left side feed, and a setup for a right side feed.
I actually found some pretty good sprites someone made of the Stoner 63, which I want to work over and do something with for some Doom thing, it's a pretty cool gun.