See my post above
X 20 GA. HEAVY FRAME (DISCONTINUED)
N 20 GA. HEAVY FRAME MAGNUM (DISCONTINUED)
K 20 GA. LIGHT WEIGHT (LW) (ALSO INCLUDES M/1100 LT)
U 20 GA. LW MAGNUM (ALSO INCLUDES M/1100 LT)


USAF RET 1971-95 [Linked Image from jpgbox.com]