Registered drop in auto-sear listed for 9mm, .223, and 7.62x39 caliber. Marked "WAC BWK GA/B261" on the underside of the block. <a href="https://www.rockislandauction.com/blog/nfa-machine-guns-and-the-collectors-market/">NFA Machine Guns and the Collector's Market</a>

Very fine with some rough machining marks, and edge wear. NOTE: This weapon is a National Firearms Act (NFA), fully transferable Class 3, which is registered with the Bureau of Alcohol, Tobacco, Firearms and Explosives, (BATFE) under the provisions of 18 U.S.C. Chapter 44 and 27 CFR part 478.