What's the differ ?  Dose the AR-15 work like this?
Once the bullet passes the gas block, the high pressure gases pressurize the cylinder pushing the piston and bolt carrier back, bolt unlocks, carrier continues to move backwards cocking the hammer and ejecting the empty case.
Is the CAR A4 a Carbine ? How dose is work ? I don't want to seem like a dumb $hit , but I really don't know ? Can you explain how ?

Quoted: What's the differ ?  Dose the AR-15 work like this? Once the bullet passes the gas block, the high pressure gases pressurize the cylinder pushing the piston and bolt carrier back, bolt unlocks, carrier continues to move backwards cocking the hammer and ejecting the empty case. Is the CAR A4 a Carbine ? How dose is work ? I don't want to seem like a dumb $hit , but I really don't know ? Can you explain how ?

You would be correct if it were a POF or DSA piston upper. The AR-15 does not have a piston. The gasses go into the gas tube and flow down the gas tube until it reaches the gas key located on the bolt carrier. Those gasses push on the gas key to push the carrier assembly back. Basically it uses the gasses in place of a piston. This is what supposidly helps with it's accuracy. You have gasses flowing back instead of a piston (heavy moving part) to throw the accuracy off. This concept at the same time also gives it the rep for "shitting where it eats". If you have shot other guns such as an SKS, FAL, or AK, you will notice the action is clean after many rounds down range. If you fire an AR-15 for a 100rds or so you will notice the bolt carrier and all the internals are dirty. Basically the AR-15 sprays carbon all over your moving parts with each shot.

Thanks for clearing that up for me. I get it now , there's no piston ! Great information ! I must do more research in the future . Thanks for your time. h.gif