Looking for opinions on guns using the blowback force to operate. I have a Sortie that appears to use only the blowback force from firing to operate. I say this because after firing the bolt moves backward and compresses the hammer spring and the reloading spring for the next shot. So the two springs do not assist the bot to move backward. I can find no other force moving the bolt backward unless there is some effect from the hammer after release.. My question is would the weight of the pellet have an influence on the blowback force of the bolt?.