Maybe you experts can help me identify this SKS. I believe it to be an early one but it's had late modifications to it, probably to import it. Serial number 111508 and importer N.A. which I believe is Navy Arms. There's no bayonet lug but it has an odd round sleeve behind the front sight. When I bought it, it had a bipod in this location which I took off and installed it instead on my long barrel NHM-91 AK. The stock is not numbered and the bayonet slot has been filled. The last 5 digits of the serial number are on the usual places, rear housing, trigger guard, magazine, bolt, etc. It has a threaded in barrel. It has the same dovetail style scope mount as on my little 16" "Cowboy Companion" I bought in the 1990's. I've done some research on the early models but I'll wait until those of you with more SKS knowledge chime in to see if I'm anywhere close.