So my wife got me a .22 conv for Christmas and I must say I love it. Blowing through 500 rds and not feeling bad about it is great BUT it's just so dirty! So only having one 5.56 upper I'd really like to get a dedicated upper for the .22 to save all that wear. Someone please correct me if I am wrong but to build an upper for 22lr I will need reciever, barrel, charging handle, and hand guard correct? I already have the bcg and have read no gas block is needed....I am new to this so please forgive me if I am showing my ignorance here. Also I would just like to add I do understand this may not be "the best or overall cheapest way" to go about this. What it does do though is allow me to spread out my cost and saves me the "I can't believe I bought that and you don't even use it arguments." Those two things make the overall effort and extra cost worth it to me lol.