Thanks For that info! I was stumped in my research since there were M2 parts on the rifle, but no letters after the serial number. It does feel like there is a block/spacer in the mag. Who would ever want a single shot M1922? LOL

I took it to 50yds, and then 150yds shooting my steel IPSC plate. I am impressed. Brings me back to my M16A2 iron sight days!