Hey folks, new member here so thanks for the add......Here is my question....I recently purchased a California compliant/Bullet button PTR 91...I would like to change this back and also add a paddle magazine release. How difficult is this to do and which parts kits do I need to do it??....One other question....Rifle also came with the polymer lower....is it worth the time to change this to a steel lower....appearance wise I think the steel lower would look better...but thats just my opinion.....Thanks again for the add