Well I was out going to a garage sell or two here in the Texas panhandle and I bought a Ruger MK 1 that says it was made in Armamex Mexico. Not sure what it is but its in about 90% condition and I was able to get it for a 100.00 bucks. Is this some kind of parts gun ? Sn starts with a R and is real close to a 1000. It only has one mag and shoots great. Thanks