not to highjack any other threads there are often questions about building AR-15 type firearms

it really isn't any more difficult than doing a brake job a few procedures to follow and a few special tools.

here is a video tutorial explaining a virtual gun builder that helps you select parts that will fit together.



and here is a link to the tool called gunstruction
https://www.ar15.com/gunstruction/

in playing with this some it is clear that it is a Brownell's product and not just from their name on it features their parts and pricing there are other options out there than what are listed ,but it more importantly lets you start to understand the relationship of all the parts and how they work together

That is amazing. It makes it too easy!!!!!