Paintball to .22 pellet conversion.

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   getting the timing right is big deal with semi autos,breech really needs stay closed until pellet gas either just left barrel or is about to and that may have to depend one the strength of bolt return spring in this design,its a balancing act if trigger dosnt have a disconnector mechanism the gun will go full auto,the disconnector should catch hammer on rebound and then prevent hammer from recontacting the hammer and opening valve again,hammer bounce is a problem with most pcp and co2 guns,not really an issue with a hand operated bolt as no more pellets being feed to breech,so just wastes propellent etc,with a semi auto the dissconnector catchs hammer and holds it even when trigger is still pulled back from first shot,when trigger is released to fire next shot it reengages the the hammer sear to fire next shot,a full auto sear the dissconnector between hammer and trigger is over ridden when trigger is pulled this allows the action to continue functioning on full auto as long as trigger is pulled and there is ammo in the mag,just a reminder that full auto airguns are illegal in nz. to explain a lttle clearer a dissconnector is a mechanical part of a trigger that operates independantly of the actual trigger that catchs and holds a hammer in its full cocked position after being cocked by th bolt reciplicating to the rear,and hold hammer in full cock notch until trigger is released when trigger then engages the true full cock notch,holds it there until trigger is pulled again to fire next shot,all semi autos have some form of dissconnector in the trigger,getting this right and to function correctly maybe your biggest head ache for you semi auto co2 guns,as for blow back cycling the action using unused co2,thats still in barrel ,thats another very different issue,most semi auto bb guns use some form of blow back,most semi auto pellet guns are use some form of blow back to recock the action but neither are true semi autos in the true sense as they dont chamber a bb or pellet but fire them directly from their mags,this is very different to what you are thinking about,been toying with the concept of true semi auto pcp guns for some time,just for the hell of it,it can be done as fx and others have proven,but its not quiet as simple as it may seem,there are two bassic ways to go about this,one,the most common used for rifles is to bleed co2/hpa from barrel usually at muzzle and redirect it to cycle bolt and action,the other way is to use one the various ways of delaying the breech from opening until pellet is about to leave barrel and the use this residual co2 or hpa to cycle the action and load another pellet on return stoke of the bolt,thelater system is the only practical way to doso in a pistol as it operstes essentually to a recoil operated semi auto pistol,but without using recoil as airguns have no usable recoil,second world war german belt feed machine guns work on this delayed breech opening system as do several modern machine gus,its simple and absolutly reliable,bit long winded but interesting topic for sure,nobody yet has produced a truely practical semi auto pcp pistol as those acailable are simply cut down semi auto pcp rifles minus their buttstocks,sawn off rifles essentually,too big and heavy to be practical pistols as sawn off rifles usually are,there have been several true semi auto co2 handguns the old crosman 600 being one the first and still a goody today if you can find one,the fun of messing around with different co2 projects is there lot potentual for all sorts projects,dont give up on your paintball projects if nothing else they will keep you occupied and out of the pub eh!!
 cheers mike