Very cool project buddy! Glad you could get the boy involved!
I was skeptical of the poly lowers, until I got one for my birthday last year! Built it on the cheap, since I still wasn't sure of it, but after I pinned an upper on it and shot it, all apprehension went away! I figured there would be a lot of flex/feedback under recoil, but it felt exactly as it should, only lighter! I wouldn't want to go into battle with it, but as a range toy/backup gun, (Mine is actually a backup for my backup!), I don't think you can go wrong!
Hi Phil! I was skeptical too but it was unwarranted. It's find. I built this one on the cheap too. I am amazed at how well it does. Like you said, I don't know if I want to go to battle with it but I'd re\ather have this then nothing!