24 July 2017


The AR-15 is a shrunk AR-10.

Modern .308 ARs aren't really more developed and refined AR-10s; they're enlarged AR-15's.

The trigger group is the most obvious place to spot differences.

The reason for this is pure economics.  Why reinvent the wheel?

Keeping parts commonality with the smaller AR-15 means you get to take advantage of the scale of production already established and you also get proven parts.  Win win.

It's a little amusing how most .308 ARs share parts with AR-15's, but except for those commodity parts, don't share parts between manufacturers.

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