New here also but after replacing the mag tube you need 2-3 more parts... got some good info from here:
https://freedomfightertactical.com/pages/922r-faq
New to the Benelli family as I just picked up a LE 11715 M4, the stock that came with it only has two positions (short and extended). Is this same as the 3 position tube that Benelli sells (SKU 70043)?