Hey all, just got my TM Glock 17 from shootgerbcgear for christmas and had some questions. The gun came with like green night sights I can attach on and replace the stock white ones, are the night sights better? How would I install the sights? I havent managed to take off the top slide yet. Also the gun shoots fine and cycles fine, I haven't shot a full mag yet but will do that soon. Should I fill with green gas for 7 seconds right? Also when I fill the mag I hear a hissing, it's loud almost as if the green gas can isn't actually filling up the mag. Also I really enjoy the gun, feels beautiful and I don't think I will be doing any other external upgrades. As for internal upgrades, I don' want any wear on the gun. Mainly to increase accuracy.