I think one of the reasons the shelves are currently empty is because of greedy people who saw an opportunity to make a killing, bought all they could carry, but not with the intention of reloading or shooting it or using it for self defense, but simply to list it on gunbroker to make insane...
The number of NIB transferables is shrinking. All transferable MG's continue to climb in price. Someone once said "You didn't pay to much for that MG, you just bought it too soon."
Brian P. has a good product and good customer service.
I shoot the original Colt LMG upper with a closed bolt and the hydraulic buffer with green spring. The hydraulic buffer slows the rate of fire and I can get accurate 2 shot bursts. Cool upper. My $0.02.