Everything was heavy though, wa'nnit?
All milled steel and hardwood.
The BAR's original raison d'etre was 'walking fire', which was a passing fancy.
After WW1, the US police models with short barrels and pistol grips made viable proto-assault rifles.
The only half-decent LMG version was the Belgian FN modele D because it was the only version with a quick-change barrel.
I reckon the best early self-loaders were non-military: Remington model 8 or Winchester 1907.