I don't think the AR15 style rifle will be going anywhere even if the Army chooses to replace M4/M16 or whatever version of the M16 is being used now.
Nearly all weapons that are actually surplus, or styled after military weapons, are still popular years after their adopting military entity has abandoned them.
AR style rifles will still be around... heck, I've seen rifles out of New York or California that are required to have a suitcase for a stock and people still buy them.
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