Hey ffs1942, this $750 Bushmaster - would it happen to be the Carbon-15 model? I'd pass on that. I kinda doubt you can find many $750 ARs right now with milspec 7075-T6 alloy receivers so I'm betting it's actually a C-15.
And honestly unless you get a screaming deal I'd pass on Bushmaster itself as you can get a higher quality PSA for about the same price. In normal times their KISS model was around $750.