This is the original, full 900-watt M9 Carbine! Sent the serial number to Mesa Boogie and had them confirm.

I love this head but a spinal injury has forced me to switch to an even lighter option.

It is in perfect working order, as far as I can tell. It lived it's entire life in a shock-mount rack case. The only real cosmetic blemishes are the couple of marks (as pictured) where it appears the screws from the power conditioner that lived above it in the rack rubbed against it and then a few random smudges and such on the bottom. I do not seem to have the rubber feet since it lived in the rack. They are a few bucks on Amazon and elsewhere if you don't also plan to rackmount.

Comes in the original box with the original pedal, extra long cable, and power cord, as pictured.

Features

Trans-Class Power

900 watts at 4 or 2 Ohms

450 watts at 8 Ohms

Rackmountable (2 rack spaces)

Active/passive input switch

Vacuum tube preamp w/1x Mesa 12AX7

Gain, Active Bass with Pull Deep, Passive Mids

5-Position Active Mid-Voicing Switch, Active Treble and Master Volume with Pull Mute

Footswitchable, assignable or bypassable 9-Band Graphic EQ with Mid-Voice Active/Defeat Switch

Assignable or bypassable compressor with independent threshold and ratio Controls

Tuner Output with footswitchable Amplifier Mute

FX Loop with Automatic Hard-Bypass to completely remove when not in use

Balanced XLR line out with Pre/Post

Switch and ground Lift

Output Jacks

Fan Cooled

2-button footswitch (EQ and Mute)

28 lbs.

3 1/2" H x 19" W x 14 3/8" D