Need help buying new gun

[Regaberto]

Ok guys I've been rattling my head figuring out how to spend my money. Few weeks ago my heart was set on a eotech exps2 than I decided I could have a new gun for what a sight cost so got me thinking a ar15 look a like 22 would be awesome. What do you guys think is better value the 15-22 or buying a cmmg dedicated upper and building a lower receiver. I do already have a ar-15 but I already know if I buy a upper ill buy a lower anyways. So what's some pros and cons of the two. I talked to my dealer and out the door the mp15-22 moe is 589 and the cmmg after I build it will probably be a hair over 6.