From what I have learned in my exploration of building my own rifles is as long as the BCG is Nickel Boron you can't lose and it is a complete bcg.
You’re new here, ain’t ya. Let me talk to you about my lord and savior Clandestine.
https://m.youtube.com/channel/UCaUOYvlDrZh5LWILrVDUM4w