Mach 6- you better build that rifle. The damn factory museum in Bulgaria doesn't even have one on display. I know because the guy who built my rifle was just there while visiting for Kalashnikov's birthday- he was invited to dine with the man himself. My rifle was built by Ted Marshall, probably the only true AK smith in the country. His builds command the fees he charges because of the accuracy and detail of his work. Down to the machining of the mag well, single hump trigger indentations, special XYX markings, rivet head patterns, detail after detail. He is an advisor for several militaries for their R&D of AK weaponry. Several of his variants have been used in Poland, Bulgaria, Russia.
Also the kit you recieved would have to built by him because the importer did not put all the correct parts together for the kit- they piece mealed several parts and just threw them in because they didn't even know what was supposed to be with it. Only Ted would know which parts were incorrect, my kit had the following parts that were wrong; front sight, rear sight block supposed to be 47 pattern but 1000 meter, bolt carrier, grip re-enforcement plate which the importer left out, selector lever was wrong, topcover, gas tube, and internals which are 74 pattern but have to be used with a retarder (cut down for legality) for the single hump indentation in the reciever. Early pattern used the plum Russian furniture with 74 front sight block to differentiate the weapon against the standard 74 caliber rifle that it looked very similar to, later models used black furniture but had AKM front sights and AKM topcovers yet retained the 74 sidefolder etc. to differentiate. Remember very limited quanities of this rifle were produced- maybe less than a couple hundred ever left the factory but it was the Bulgarian attempt at a stamped 5.56 rifle, they later went to strictly milled on that model.
Here are some markings I can give you, front sight marked with a crylic (spelling) "N", gas block "4", trunnion double circle code "10", with "24", selector markings are "AB", then "E, crylic N", not the same as the Russian markings at all- Bulgarians use a slightly variant alphabet. Topcover, carrier, bolt, all have last four of serial. Production years not marked for this model. You have to use a modified hammer retarder to work in the single hump indentation of the reciever, a grip re-enforcement plate which also is needed to get proper angle for feeding, the proper bullet feed ramp guide, .
Basically the whole reciever will have to be redone to exact specs, not the other way around that most idiot smiths build which is to fit the parts to the non-spec reciever. Rivets have to be countersunk, and each one has variance of pressure to form the proper rivet head shape. Selector and mag well both stamped for proper military accordance. Honestly I can't describe it all. If you have an e-mail address I would be happy to send you more info.
You can use any reciever but honestly Ted will charge you to re-machine, re-stamp, and re-cut to exact specs since no one makes or imports the proper reciever, not Global, not even Arsenal as they changed the design slightly. I used a pre-89 reciever and the only way you could tell what country it originated is by the markings which were moved to the bottom under the trigger guard. It is to exact spec. etc.
Here are some specifics as well- the AKS-74 M1A1 incorporates both 47 and 74 design into the implementation of the build unlike the AK101 which the Russians use almost exclusive 47 pattern, or the Romanians in their 5.56 rifle use a 74 pattern, and the Polish EM is 74 pattern. The Bulgarians used both for theirs. If you decide to sell your kit let me know- I will take it.
Creeper