In my opinion an absolute must have. - Magpul Industries B.A.D. Lever

This increases the functionality of the rifle so well it’s fantastic. Makes it so much easier to manipulate the bolt catch from basically any grip position on the rifle without having to move your hands or change your grip. The stock button to me was not very easy to work with, this is an amazing upgrade. Price is great and it looks cool too. Still leaves plenty of room inside the trigger guard for your finger.