Does anyone else remember the "creative" match rifles fielded by some units in the 1980's?

These were selected A2 upper assemblies mated to "refreshed" A1 lowers. Privately owned ones were built on commercial "A1" style lowers. Butts could be A1 or A2 as required by the geometry of the shooter. Internal / invisible "float-tubes" started appearing (or NOT appearing), inside the round A2 handguards, as well. Some Reserve and Nat. Guard units nearer the bottom of the food-chain purchased A2-style upper assemblies and did their own thing on their least-tired A1 lowers.

The idea of the "early" lowers / trigger mechs. was to get around the peculiarities of the three-round burst trigger pressures.
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