BudsGunShop.com - Everything included to put on my lower and go?

yes put it on and rock and roll no other parts needed

Hi Erik, nothing else needed, it even comes with flip-up sights, a 5rd magazine, and a 3oz buffer.
Stay safe & have a great day!

Hi Erik and welcome. This is ready to install and start shooting including the 5rd magazine and 3 oz buffer as pictured here : https://americantactical.us/product/ati-alpha-maxx-410-upper-shotgun-kit-gen3-3-410ga-18.5-bbl-smooth-bore-13-poly-mlok-f-u-sight-5rd

Nothing else needed, complete upper.