just be careful around here bruce, as a fellow ectomorph with a ridiculously low body fat % i can tell you that you will get a lot of haters and a lot of bullshit calling whenever you post stats for being a little guy.
i have gone thru this with these guys numerous times. my natty peak after years of eating like a mofo and working out was under 120lbs, i'm 5 7" a few test cylces had me to 150 and i just lost a lot of that due to unforseen circumstances. my body fat has never been over around 4% but all these bros here do is call bullshit.. thats like me giving people a hard time for being fat asses, we're all here to get our bodies where we want them.
if you wanna gain serious size my bro, use the test like silver back said, for me however , test is no longer an option, too much acne when i use test, and i dont like the hair growth, so i will take the ssslllloooowww and steady routine back to my goal of 160lbs... primo right now (125mg/week test maintenance) maybe next time some eq.. but no heavy test cycles for me anymore, even if it takes me all year to get there...
good luck homie.