hello everyone, i just got my rifle put together today. i bought a spikes tactical complete upper and a spikes stripped lower, which i built the way i wanted. i have a few questions, ive been trying to google this and have got a few different answers. does the hammer need to be cocked or uncocked to remove/install the lower from the upper? is it okay to dryfire with the upper installed on the lower? (just wondering because how else would the upper be separated from the lower uncocked) sorry for the dumb questions but i want to make sure im not doing something wrong. ive been doing alot of research on ar15's and was hoping i wouldn't have to ask such a question. i apologize once again anything else you would like to add go right ahead, im trying to learn all i can. thanks!