A Commercial SKS is an SKS that has been modified from it original military configuration for resale in the good ole USA. The Chinese and the importers modified the SKS into various packages in an attempt to sell you more than one rifle. The following is a master list of the different packages sold in the heyday of importation. 1984 to 1994. I will put this list into two groups Modified and New production.
MODIFIED Manufactured from existing rifles. They are not factory or serial number specific. There is one exception see Polytech Hunter.
Chinese Honor Guard with Norinco documentation.
Briklee Hunter 16.5" barrel, bayonet and Type 89 railed mount and red ring 4x20 scope.
Composite stocked (green [parka] and black [stealth]) and parkerized actions. 20.5 and 16.5 barrels.
Wood stocked with scope mount (rail to nowhere/west coast rail). 20.5 and 16.5 barrels.
Midwest Ordnance AK conversion. All conversion work done in the USA.
MC-5D C&A import. 16.5 barrel. AK mag conversion. Standard style mag release. Monte Carlo stock.
Navy Arms Imports. All.
Precision Degree rifle Standard long barrel configuration with unique Chinese markings.
Assault Carbine (Type 84) 16.5 barrel, bayonet, AK magazine conversion and bolt hold open. new
Farmer's Friend Type 86 scope and railed mount, bi-pod in place of bayonet, green transit case.
Sharpshooter Type 89 railed mount and BZM-1 scope. Standard long barrel configuration.
Sniper Type 89 railed mount with PU scope. Standard long barrel configuration,
Cowboy's Companion Mid Receiver 16.5 barrel, neutered bay lug, Type 86 scope and d+t mount.
Cowboy's Companion 16.5 barrel, neutered bay lug. Type 89 railed mount and Polytech scope.
T-56 Para 16.5 barrel, blade and spike bayonet, Type 89 railed mount and Polytech scope.
Hunter 16.5 barrel, neutered bay lug. Type 89 railed mount and Polytech scope.
Paratrooper All importers. 16.5 barrel, FIXED 10 round mag, blade and spike versions.
Polytech Hunter Serial numbers 0 thru 985. Imported by Century. 16.5barrel, 5 round fixed mag. Bayonet delete.
18" barrel All of these rifles do not have bayonet lugs.
Six Corp Detachable bayonet
NEW PRODUCTION All rifles have the same features found at the end of Chinese SKS production. Including but not limited to. Pinned barrels and stamped trigger groups and new parts with no serial numbers (not scrubbed).
M8 Imported by Clayco Sports. Cleaning rod holder in place of bayonet lug. Otherwise long barrel configuration.
SKSS 16.5 barrel. FIXED 10 round mag, short gas system.
.223 20" barrel, no bayonet (M8, Sporter FSB), detachable mag, dual mag release. new
ALL OF THE REMAINING AK MAG RIFLES NOT LISTED ABOVE.
SKS-30 20" long barrel military configuration with removable bayonet. new
SKS 63 Long barrel configuration. Bayonet lug milled off. Thumbhole stock.
SKS Sporter 16.5 barrel, cleaning rod holder, short gas system with Thumbhole stock.
SKS M 16.5 barrel, cleaning rod holder, short gas system and Monte Carlo stock.
SKS NR 16.5 barrel, cleaning rod holder, short gas system with Thumbhole stock.
SKS 93 16.5 barrel, cleaning rod holder, short gas system with Thumbhole stock.
Molot Sniper Russian SKS with PU scope mount.
American Historical foundation Vietnam War Trophy edition.
Widener's M59 M59/66A1 with the grenade launcher removed
Inter Ordnance Sniper M59/66A1 with 8x32 POSP scope.
M59/66A1 All with four digit serial number starting with A001. New. Post military production.
G10 A factory refurbished M59/66 that has had the grenade launcher and grenade sight ladder removed and all parts scrubbed. A new S/N is applied along with a G10 stamping on the receiver.
G16 A factory refurbished M59/66 that has had the grenade sight ladder removed, the grenade launcher replaced with a muzzle brake, and all parts scrubbed. A new S/N is applied along with a G16 stamping on the receiver.
Canadian AK magazine
Three versions have been seen. new
Research continues. I will update when new information is presentable.