"Mutt" I like that, I think you just named my rifle.You are right it has a little of everything.
I just finished putting it together last night and plan to shoot it this weekend or over the 4th.
Stag A2 stripped upper with mostly DPMS small parts.
DPMS 11 1/2" heavy countor barrel with pinned and welded flash hider from Model 1 Sales.
S&W stripped lower with Daniel Defense parts kit.
A2 stubby entry stock from Model 1 Sales.
Colt bolt and carrier assembly
XS sights white stripe with tritium insert front sight blade.