Quoted: good question
I am interested in knowing that. (suffice it to say, it will be a lot less than 87 )
Many AR "manufacturers" are actually assemblers, and marketing companies
If we are talking actually starting from scratch and forging metals into parts, machining small parts etc. - I would imagine there are very few - at Bushmaster or most others.
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redfisher is right... Though it gets a little "cloudy" given your definition of "made by".
In many cases it makes sense for them to NOT make the part. Barrels come to mind first. Why do it yourself, when they can buy from Wilson, etc. Some, however, will buy the blank and finish/chamber it themselves.
The same goes for uppers and lowers. Some sub the whole upper or lower out, some buy them "in the white" and do the machining to their own specs. This allows them to skip the acutal forging stage but still gives them most of the quality control.
Somewhere in between are lower parts kits. Many buy the components in bulk from someone doing LOTS of them and either assemble or repackage for retail sale.
Plastic molding is another example of where the economies of scale make it a reasonable prospect to simply buy from the OEM.
All of this is precluded by the quality control that is either in place at the OEM, or in the pre-assembly inspection of the incoming parts.
If all the "manufacturers" made all their own parts, an AR would be much more expensive.
ETA: pantera, you'll find that you get a better response to your questions if you're a bit more specific in the subject of your post. This also allows for searching later. ie: "Does Bushmaster make their own parts?" or "Which companies make their own parts".