One of the AR-18 design failures is the front take down pin slot up front. It is not robust enough. People have been known to remove the rear take down pin and let the upper drop forward. This puts to much stress on the little bit of metal the from take down passes through just forward of the magazine well. One or both of those little ears has been known to break off, making for an unusable lower.
I think there is a company in the US that makes new AR-18 lowers with some design changes to be more robust and use more AR-15 parts.
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