So in your first post you say that only the buffer spring and buffer was changed.
Then you say that you also changed the buffer tube and the stock.
This makes no sense. You claim to have nay changed the buffer tube, buffer, and spring, along with the stock. Did you also replace the barrel and or the gas block?
Yes, I changed all those rifle parts to carbine parts. From what I've read, the gas port in a 20 inch barrel is a smaller size than the port in a shorter barrel. I'll see if my theory is correct this weekend.
Now you state that you also changed the barrel and the gas block.
You ask for help but give conflicting information making it impossible to give you any help. If it where not against forum rules I would call you a derogatory name. Rest assured that I am thinking it. If you want help you need to be straight with the info you provide so that people can help you, otherwise you are wasting everyones time.
Sorry if I offended you. The information may have been incomplete, but it was never conflicting. I did change the stock, which explains the "featureless" part of my original post. I did not change the barrel.or any of the upper parts. If you want to call me names, go ahead, if it makes you feel better. I did the best I could.