Abstract: A compressed gas powered projectile accelerator employing dynamic-regulation; having, a valve slider, reciprocally moveable within a passage, being releasable by the action of a sear and trigger from a cocked position, controlling flow of compressed gas into a breech; or an electric valve performing the same function under the control of an electronic circuit and trigger; and a spring-biased bolt, reciprocally moveable within the breech, controlling the flow of projectiles and compressed gas into a barrel.

Abstract: A compressed gas powered projectile accelerator employing “dynamic-regulation” as herein defined; having, in a simple-to-manufacture, easy-to-maintain, durable preferred embodiment; either a slider, reciprocally moveable within a passage, being releasable by the action of a sear and trigger from a cocked position, controlling flow of compressed gas into a breech; or an electric valve performing the same function under the control of an electronic circuit and trigger; and a spring-biased slider, reciprocally moving within said breech and a barrel, controlling the flow of projectiles and compressed gas into said barrel. Said compressed gas-powered projectile accelerator circumvents many of the problems associated with projectile accelerators known to be in the art, capable of reliable semi-automatic and fully-automatic operation using carbon dioxide liquid/gas mixtures.