Semi-auto .22 LR rifle patterned on the M4, 16” barrel, adjustable stock. Base model is the M4-22 Pro. Available upgraded models include M4-22 Elite (add $40 premium to NIB value), M4-22 Sharpshooter with scope (add $220), M4-22 MMSSA (add $200), and M4-22 MMSSA Competition (add $380).