Recently I bought the M&P 15 sport after looking at them over the last few weeks. I have an 15 22 for 2 years now and love it but wanted something new to play with. My question is, how much different is it to clean the the 15 22? I really don't know much about how the gas block works and what to make sure gets cleaned after firing. I want to clean and lube the barrel before taking it to the range for the first time.