Auto-Ordnance's AOM160 is an updated version of the venerable M1A1 Carbine. Aftermarket accessories, like the Ultimak Picatinny rail on the tested model, are readily available.
This may be one of the most frustrating guns I’ve tested. Don’t get me wrong. There were no failures to feed, stoppages or malfunctions of any sort in more than 100 rounds, and the gun handles like a dream.