as shown in fig1 of the drawings , one exemplary embodiment of the present invention is generally shown as a paintball marker 100 . the paintball marker 100 includes a main body 200 with a barrel 214 attached to the front 201 of the main body 200 , a grip frame 218 connected to the bottom 211 of the main body 200 , and also a pressure regulator 234 connected to the bottom 211 of the main body 200 to supply pressurized gas 232 into the main body 200 . the main body 200 defines both a main gas passage 202 that allows for pressurized gas 232 to flow into the main gas chamber 204 and the valve 229 , a separate controlling gas passage 206 that is connected to a bolt chamber 208 and the valve 229 , and an atmospheric pressure passage 207 that is connected to the valve 229 . these chambers and passageways are used by the valve 229 to control the supply and quantity of gas released into the breach 210 of the main body 200 . the breech 210 has a first initial diameter 213 sized to the paintball 230 , the bolt chamber 208 has a bolt stop shoulder 209 which steps up to the second diameter 215 , and then a main shoulder 233 steps up to the main chamber diameter 231 . a seal support 201 is used to seal the main chamber diameter 231 of the main gas chamber 204 . a paintball supply passage 212 is also connected to the breach 210 so that paintballs 230 can be supplied into the breach 210 . the barrel 214 is connected to front 201 of the main body 200 so that the paintballs 230 can be loaded from the breach 210 into the rear 216 of the barrel 214 . pressurized gas 232 is supplied from an external source ( not shown ) through the pressure regulator 234 . the outlet 236 of the pressure regulator 234 is connected to the main gas passage 202 to supply the pressurized gas into the main gas chamber 204 . a grip frame 218 is connected to the bottom 211 of the main body 200 . the grip frame 218 includes a trigger guard 220 protecting a trigger 222 and internally houses a trigger switch 224 connected to a circuit board 226 powered by a battery 228 . the circuit board 226 controls the operation of a three way valve 229 . the three way valve 229 is connected between the main gas chamber 204 and the controlling gas passage 206 , and the controlling gas passage 206 and the atmospheric pressure passage 207 . a bolt 250 is mounted within the main body 200 in the bolt chamber 208 . the bolt 250 has a front 252 defining bolt gas passages 262 , a back 254 with a spring contact ring 255 , an outer surface 256 with a shoulder stop 257 , and a front inner surface 258 with an internal impact ring 260 and a back internal diameter 259 within the bolt 250 . the bolt moves between the loading position 264 shown in fig1 and the firing position 266 shown in fig2 . the bolt 250 slides over an annular cylinder 272 and is slideably sealed with the annular cylinder 272 by a bolt seal 268 . the bolt 250 is biased backwards by a bolt spring 270 that pushed against both the spring contact ring 255 of the bolt 250 and the bolt stop shoulder 209 of the main body 200 . the annual cylinder 272 has a back face 279 with chamber diameter 273 matching the bolt chamber 208 with face step 278 to a bolt diameter 276 matching the back internal diameter 259 of the bolt 250 , and an internal diameter 277 for holding the power tube 280 . in addition to the seal to the bolt 250 , the annual cylinder 272 is sealed to the main body 200 by sealing rings 274 and is sealed to the power tube 280 by the tube seal 275 . the power tube 280 has an inside 282 defining an internal tube passage 283 , a front 284 , a back sealing surface 286 , and an outer surface 288 with a main body diameter 290 and a striking surface 292 . an outer pressure ring 300 is mounted to the outer surface 288 of the power tube 280 so that a valve spring 304 can biased the power tube 280 backwards in relation to the main body 200 to press against the main seal 302 that is mounted on the chamber extension 205 to form the release valve 306 . operation of the paintball marker 100 can be understood from this construction . paintballs 230 are fed downwardly through the paintball supply passage 212 into the breech 210 in front of the bolt 250 . pressurized gas 232 such as compressed air , nitrogen , or co2 is supplied to the pressure regulator 234 from a tank or supply line ( not shown ). the pressure regulator 234 regulates the incoming gas and supplies this regulated pressurized gas 232 at outlet 236 . the outlet 236 is flowably connected to the main gas passage 202 to supply gas into the main gas chamber 204 . the main gas passage 202 can be an internal channel or an external hose that connects the outlet 236 to the chamber 204 . the control valve 229 is a solenoid 3 - way valve that is controlled by the circuit board 226 according to the operation of the trigger 222 . fig1 shows the control valve 229 connecting the controlling gas passage 206 to the atmospheric pressure passage 207 . with only atmospheric pressure on the back of the bolt 250 , the bolt spring 270 forces the bolt into the loading position 264 shown in fig1 . similarly , the release valve spring 304 seats the power tube 280 against the main seal 302 . thus , the paintball 230 is loaded in the breach 210 and the main gas chamber 204 is charged so that the marker 100 is ready to fire . upon sensing the pull of the trigger 222 , the circuit board 226 uses an electric signal to change the position of the three way control valve 229 to that shown in fig2 . the control valve 229 is now connecting the main gas chamber 204 with the controlling gas passage 206 so that pressurized gas 232 can flow to the back 254 of the bolt 250 . the force of the pressurize3d gas 232 on the back 254 of the bolt 250 overcomes the force of the bolt spring 270 and forces the bolt 250 forward . as the bolt 250 moves forward , the front 252 of the bolt 250 chambers a paintball 230 into the rear 216 of the barrel 214 . the impact ring 260 of the bolt 250 then contacts the striking surface 292 of the power tube 280 to move the power tube 280 forward . the forward movement of the power tube 280 separates the back sealing surface 286 of the power tube 280 from the main seal 302 to allow the pressurized gas 232 to flow out of the main gas chamber 204 and into the inside 282 of the power tube 280 . the pressurized gas 232 flows forward through the bolt 250 and out of the gas passages 262 to the paintball 230 to launch the paintball 230 out of the barrel 214 . after an appropriate time delay , the circuit board 226 then shifts the control valve 229 back to the normal position shown in fig1 . this again connects the controlling gas passage 206 to the atmospheric pressure passage 207 to relieve the gas pressure from the back 254 of the bolt 250 . the bolt spring 270 returns the bolt 250 to the position shown in fig1 so that another paintball 230 can be loaded . similarly , the valve spring 304 return the power tube 280 to the position shown in fig1 where the back sealing surface presses against the mail seal 302 to seal off the main gas chamber 204 so that the pressure regulator 234 can recharge the main gas chamber 204 for the next operation cycle . it should be understood that the mechanical springs and pressurized gas systems are interchangeable . for example an easily recognizable alternative would be to include a bolt that uses a spring to propel it forward and compressed gas to move it rearward , or a bolt that uses compressed gas to move it both forward and rearward . similarly , the electronic valve control could be replaced by the prior art &# 39 ; s spring and mechanical sear combinations to control movement of the bolt and the power tube . reference numerals used throughout the detailed description and the drawings correspond to the following elements : paintball marker 100 main body 200 main front 201 main gas passage 202 seal support 201 main gas chamber 204 chamber extension 205 controlling gas passage 206 atmospheric pressure passage 207 bolt chamber 208 bolt stop shoulder 209 breach 210 main bottom 211 paintball supply passage 212 first initial diameter 213 barrel 214 second diameter 215 rear 216 grip frame 218 trigger guard 220 trigger 222 trigger switch 224 circuit board 226 battery 228 three way valve 229 paintballs 230 main chamber diameter 231 pressurized gas 232 a main shoulder 233 pressure regulator 234 outlet 236 bolt 250 front 252 back 254 a spring contact ring 255 outer surface 256 shoulder stop 257 inner surface 258 back internal diameter 259 impact ring 260 gas passages 262 loading position 264 firing position 266 o - ring seal 268 bolt spring 270 annular cylinder 272 large diameter 273 sealing ring 274 tube seal 275 small diameter 276 internal diameter 277 face step 278 back face 279 power tube 280 inside 282 internal tube passage 283 front 284 back sealing surface 286 outer surface 288 main body diameter 290 striking surface 292 outer pressure ring 300 main seal 302 valve spring 304 release valve 306 from the foregoing , it will be seen that this invention well adapted to obtain all the ends and objects herein set forth , together with other advantages which are inherent to the structure . it will also be understood that certain features and subcombinations are of utility and may be employed without reference to other features and subcombinations . this is contemplated by and is within the scope of the claims . many possible embodiments may be made of the invention without departing from the scope thereof . therefore , it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense . when interpreting the claims of this application , method claims may be recognized by the explicit use of the word ‘ method ’ in the preamble of the claims and the use of the ‘ ing ’ tense of the active word . method claims should not be interpreted to have particular steps in a particular order unless the claim element specifically refers to a previous element , a previous action , or the result of a previous action . apparatus claims may be recognized by the use of the word ‘ apparatus ’ in the preamble of the claim and should not be interpreted to have ‘ means plus function language ’ unless the word ‘ means ’ is specifically used in the claim element . the words ‘ defining ,’ ‘ having ,’ or ‘ including ’ should be interpreted as open ended claim language that allows additional elements or structures . finally , where the claims recite “ a ” or “ a first ” element of the equivalent thereof , such claims should be understood to include incorporation of one or more such elements , neither requiring nor excluding two or more such elements .