I looked over a 16 gauge A-5 in a gunshop today. St. Louis address on barrel, which was also marked for 2-3/4" shells. Barrel was also stamped "OK", whatever that signified. It had the old style safety on the front of the trigger.

Condition was so-so (good?) with lots of wear on the metal and wood. It appeared the stock had been shortened when the recoil pad was added. Didn't have a tape with me, but it seemed about 13".

Price was $450 and I passed.