The Prototypical 
Guide To 
Paintball Guns 
PUMP GUNS
Paintball Rifle

From the Proto Colection 1998
Manufacturer Armson
Action Pump, Under Arm Cocking
Configuration Bore and Valve In Line
Valve Style Nelson Based
Caliber 68
Velocity Adjustment Down Barrel - Main Spring Compression
Feed Type Direct Feed, Breach Drop
Barrel Nonremovable 11" 
Internally Rifled Aluminum
Gas Source Constant Air Adapter
Features: Options:

Protobable - This gun's name is dirived from it's barrel, obviously not from its configuration.  It was actually the first paintball gun with a practical internal rifling.