Was thinking about getting a nice SR9 but after reading all the 922R related stuff too many questions came up .... lol. Any help is appreciated . 1). How early are SR9 rifles with bellow 200 serial number KA code ? 2). Is it common/probable for that early of a rifle ( not stamed TC)to ORIGINALLY be in SR9TC configuration ? 3). What US made parts are on those rifles as they were sold new? (If any). 4). Do SR9 owners have freedom (922r) to change parts on their guns at will? For example a SR9T owner want the thumbhole stock back on their rifle? Or wants a wide HK forearm ? Or replace the PSG1 grip with something else ? Etc. 5).is HK claw mount the best way to mount the scope, or are there better options? 6). Did HK ever made a thubmhole stock for a 91/93 ? Just want to have all that out of the way before I decide on the rifle. Thanks .