Arsenal in Kazanlak, Factory 10.Milled AK-47s, AK-74s and the SLR sporters.
1The Bulgarian Kalashnikov

Bulgaria built the Kalashnikov under Soviet license at the Arsenal factory in Kazanlak, marked with the number 10 in a double circle. Bulgarian rifles are known for milled receivers long after other countries moved to stamped ones, and for some of the best quality of the Warsaw Pact AKs.
For the civilian market Arsenal built the SLR-93, SLR-95, SLR-101 and SLR-104 lines, and Arsenal Inc. in the United States sold the SA M-7 family built on Bulgarian receivers. Bulgarian AK-74 and AKS-74U parts kits were also common in the United States.
2Rifles in the Archive
From the original AK-47.us rifle pages, 2005 to 2008.

AK-USA AK-74
5.56 NATO Cartridge. Stamped Receiver.

IGF AK-74
Cartridge. Stamped Receiver.

KCI Model SLR-104

ORF – Ak74 Rifle Poly
Brand new Bulgarian Ak74 kit built on OOW receiver.

ORF – Ak74 Rifle Wood
Brand new Bulgarian Ak74 kit built on OOW receiver.

ORF – Ak74S Poly
Brand new Bulgarian Ak74 kit built on OOW receiver.

ORF – Ak74S Wood
Brand new Bulgarian Ak74 kit built on OOW receiver.

ORF – Krinkov

SA M-7
7.62×39 Cartridge, milled receiver

SA M-7 (Ban Style)
7.62×39 Cartridge, milled receiver

SA M-7 A1
7.62×39 Cartridge, milled receiver

SA M-7 A1 R
7.62×39 Cartridge, milled receiver

SA M-7 Carbine
7.62×39 Cartridge, milled receiver

SA M-7 Classic
7.62×39 Cartridge, milled receiver

SA M-7 R
7.62×39 Cartridge, milled receiver

SA M-7 S
7.62×39 Cartridge, milled receiver

SA M-7 SF
7.62×39 Cartridge, milled receiver

SA M-7 SFC
7.62×39 Cartridge, milled receiver

SA M-7 SFK
7.62×39 Cartridge, milled receiver

SAS M-7 (Ban Style)
7.62×39 Cartridge, milled receiver

SAS M-7 Classic
7.62×39 Cartridge, milled receiver

SAS M-7 Classic (Ban Style)
7.62×39 Cartridge, milled receiver

SLR-93
Cartridge: 7.62 x 39 mm Milled Receiver. Like the SLR95 but with wood stockset.

SLR-95
Cartridge: 7.62 x 39 mm Milled Receiver.

SLR-101 S
7.62×39 Cartridge, milled receiver

SLR-101 SG

SLR-101 SG1
7.62×39 Cartridge, milled receiver
3Factory Markings

Double circle ten mark

Single circle 25 number mark

Double circle 21 number mark
4Military Model List
Models listed on the 2014 AK-47.us Kalashnikovs by Country page.
5Bayonets, Kits and Buying
Bayonets
Bulgarian AK-47 and AK-74 bayonets. In the archive: AK-47 First Model Bulgarian – Early, AK-47 First Model Bulgarian – Vinal Hanger, AK-74 Bulgarian, AK-74 Bulgarian from Iraqi contract, AKM Type II / early AK74 Bulgarian.
AK47 BayonetsParts Kits
Kits from the archive: AKM-74 milled, AKM-74 stamped, AKM-74 stamped / wood, AKMS-74, AKS-47S side, AKS-47S under, AKS-74M, AKS-74NU Blond, AKS-74NU Brown, AKS-74U, AKS-74UL, RPD, RPK 74B.
AK47 Builder