The problem lies in what can be expected to go wrong when up to 62,000 PSI (Max 308 SAAMI spec chamber pressure) is applied to various components that were NOT designed or specified to be compatible with each other. There isn't a standard here, no uniform specification. It's not a small frame AR with a Mil-Spec shared among manufacturers. There is not only no guarantee of compatibility, there is no design nor specification of compatibility. I've worked in manufacturing and machining for quite a few years now and I know full well what tolerance stacking, complacency, and various other quirks of human nature and flaws within the human attention mechanism can mean to a finished product. Combine that with the random outcomes of mixing unmatched components from varying manufacturers with varying degrees of quality control and you're begging for a disaster. This surely can't be difficult to grasp.