Thanks!
Yes i see some companys like DSI make their owner uppers and lowers, CBG and barrels and many other parts i believe. They seems to bring in things like grips and arm brace. They seem to list most parts as DSI .
Then when i look at other companys its not as clear and I dont know what parts are quality parts or not from other sources. I know from my bolt guns both stock and custom...things like Bartlein barrels, cut vs button rifling , timney triggers vs trigger tech vs B&A, control round feed vs push..etc .
MM seems to make some of their own stuff but source others, same for Troy and seems to be the same for Radical
So what are the "good" manufacturers of other parts?
ARs seems to be bunch of parts just trying to figure out what parts are good