The buffer, gas block and muzzle compensator has nothing to do with pierced primers.. You need to send it back in or have some one with knowledge check your rifle over..
The primers will pierce based on a combination of three factors. There can be different causes for each of these factors..
Case pressure
Primer type/ thickness
Firing pin hole fit
I would take any reviews on line (especially from the manufacture) with a large dose of salt, case in point...
https://www.youtube.com/watch?v=eAuTHPdUchU&t=9s
The primers will pierce based on a combination of three factors. There can be different causes for each of these factors..
Case pressure
Primer type/ thickness
Firing pin hole fit
I would take any reviews on line (especially from the manufacture) with a large dose of salt, case in point...
https://www.youtube.com/watch?v=eAuTHPdUchU&t=9s