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No such thing as an A2 lower receiver to my knowledge. There was a lower they called an "ungated" M16 that didn't have the raised areas around the mag release that protected it from accidental bumping. But if memory serves, that mod was put in place when the first batch of M16s rolled into USAF hands. The ungated ones were the initial batch put into special ops hands way before the big .mil ever bought them.
Again, if memory serves.
ETA: Colt Model 601-604 which were the original Armalite pattern without the mag release guards. The 605 was when they added the gates.
Model 601
Again, if memory serves.
ETA: Colt Model 601-604 which were the original Armalite pattern without the mag release guards. The 605 was when they added the gates.
Model 601
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