A material dispensing system comprising: a housing (110, 120, 160) having a configuration capable of receiving a packaging containing a material therein; at least one nozzle tip associated with said housing (100, 120, 160), said nozzle tip including at least one piercing projection having a configuration capable of piercing the packaging and allowing the material in the packaging to be dispensed from said nozzle tip; at least one piston rod at least partially slidably received in said housing (110, 120, 160), said piston rod having a configuration capable of compressing the packaging toward said piercing projection; at least one motor; a trigger that operates the motor in use; and a transmission assembly selectively operably coupling an output of said motor and said piston rod for powered translation of said piston rod in at least one of a forward direction and a reverse direction, said transmission assembly including at least one sun gear, at least one planetary gear, a ring gear and a lock block, the at least one planetary gear operably engageable with the at least one sun gear the ring gear receiving and operably engageable with the at least one planetary gear; and the lock block moveable to operably engage with said ring gear to prevent said ring gear from rotating; characterized in that a gearbox is provided and is configured to receive said at least one planetary gear, said at least one sun gear, said ring gear and said lock block, said gearbox defining a channel configured to slidably receive said lock block; said trigger includes an extension that is received in a slot defined in said lock block; said ring gear defines multiple radially arranged notches, and said lock block includes a detent configured to be receivable in at least one of said notches when said lock block is moved in an engagement position upon depression of the trigger; and wherein an axis of rotation of said at least one sun gear is parallel with a longitudinal axis of said piston rod. a housing (110, 120, 160) having a configuration capable of receiving a packaging containing a material therein; at least one nozzle tip associated with said housing (100, 120, 160), said nozzle tip including at least one piercing projection having a configuration capable of piercing the packaging and allowing the material in the packaging to be dispensed from said nozzle tip; at least one piston rod at least partially slidably received in said housing (110, 120, 160), said piston rod having a configuration capable of compressing the packaging toward said piercing projection; at least one motor; a trigger that operates the motor in use; and a transmission assembly selectively operably coupling an output of said motor and said piston rod for powered translation of said piston rod in at least one of a forward direction and a reverse direction, said transmission assembly including at least one sun gear, at least one planetary gear, a ring gear and a lock block, the at least one planetary gear operably engageable with the at least one sun gear the ring gear receiving and operably engageable with the at least one planetary gear; and the lock block moveable to operably engage with said ring gear to prevent said ring gear from rotating; characterized in that a gearbox is provided and is configured to receive said at least one planetary gear, said at least one sun gear, said ring gear and said lock block, said gearbox defining a channel configured to slidably receive said lock block; said trigger includes an extension that is received in a slot defined in said lock block; said ring gear defines multiple radially arranged notches, and said lock block includes a detent configured to be receivable in at least one of said notches when said lock block is moved in an engagement position upon depression of the trigger; and wherein an axis of rotation of said at least one sun gear is parallel with a longitudinal axis of said piston rod.