Can You Put Any AR10 Upper on Any Lower
You are halfway through a custom build, with parts laid out on the bench, and the plan seems simple enough. Pick a quality upper, match it with a lower, and you are good to go. But once you start digging into AR10 platforms, things quickly become less straightforward.  A common question comes up early: can you put any AR10 upper on any lower? It sounds like it should...
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