I put one of those GAT trigger activators on a semi lower for my Lakeside belt fed. I just spin the crank with my index finger. Since the Browning design is a slower RPM I don't feel like I'm missing out on anything plus the 200 round belt empties slower. I'd really like to be able to put spade grips on it with some sort of finger crank system so it can be a miniature crew served gun.
The OP stated he wanted something stronger than a 556. I like the MCR but it does not fit his requirements. I have a few barrels for mine and it only takes 5 seconds to sap them out for cool down.
Now a cool conversion would be BRP's belt-fed upper, the XMG. I talked to the owner and he is not making them anymore unfortunately. I missed out on a lightly used one last summer that sold for $5000. Since I could not use it on my NFA lower I passed but now I regret it. Based on the MG34 it could run 8mm or 308.

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