At what point will you determine the answer was (or wasn't) correct? I'm surprised that you seem to think a manufacturer wouldn't have a good handle on what their product is or isn't.
Possibly, but it doesn't take much effort to ask for the folks who have the technical expertise to give you a dependable answer.
No, they probably wouldn't, but there are several really good reasons why:
#1. Liability. They stand behind their product and can't and shouldn't guarantee compatibility with other manufacturers.
#2. Profitability.
#3. Impossibility. Stag Arms doesn't manufacture AR-10 lowers, they're appropriately designated Stag 10 to differentiate themselves from actual AR-10 components.