Aircav73, I bought the carbine from Brian yesterday.I recognized as it as scarce variant. As you are ,I am also a 1stCav vereran. Hq Battery 5/82 Arty . Korea. After disassembly of the carbine, I find the (bolt,trigger hsng )are Nat'l. Postal Meter. The slide is Inland, and the barrel is as expected Winchester. I have already located a Winchester type 4 slide, however no w bolt as yet. Garry Owen