Hey everybody. I bought a new g19 gen4 and went out and shot it today. It shot great. My question is when my slide locked back after the last round in the mag, i dropped the mag, put in a new one and slapped it in. when i did this the slide went forward and chambered a round. I did this a few times. So i tried it without any rounds in the mag and nothing happened. The slide didnot go forward. Is this because the mags are new or is it something else. Thanks. New glock owner. New to glocktalk.