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I would almost have to think its with the combo going on inside the Battle Arms PDW.
Easy way to tell it throwing that upper on another lower though.
Ive shot reloads under the gemtech FPS and still had the bolt hold open so the ammo should be fine
I don't see why the mags would have anything to do with the bolt holding open
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I have been doing a lot of research and I think it's the Battle Arms secondary spring on the buffer. You can feel the spring resistance really ramp up when you slowly charge the rifle.
Gonna try supers and see how it goes. Also, gonna try a 5.56 upper that has a 16" BCM enhanced lightweight barrel (anyone know the gas port size on these)
Last I will try the 300BLK upper in question on another SBR lower that I have but I still need to put it together and figure out what stock I'm going to use on it; probably something more conventional.
I looked over under the Battle Arms industry section and they say they have a 300BLK running using 220gr Remington. But also say that you may need to open the gas port. Ideally I want that to be a last resort.