AK -Adjustable Muzzle Brake
B -Laminate Stock
C -Clip (Detachable Box Mag.)
F -Synthetic Stock
G -Hardwood Stock
H -Hinged Floor Plate
L -Left Hand
LE -Law Enforcement
ML -Muzzleloader
S -No Sights
P -Police
SE -Safari Express
SS -Stainless Steel
U -Ultra High Lustre
V -Long Range (Heavy Barrel)
XP -Package Gun
Y -Youth

Have no clue what the K is. AK is the brake on the front