PMM BCD for FN SCAR (Battery Control Device)

I am very pleased with the BCD, it fits perfectly and great quality work. The service at Parker Mountain is second to none. Now the only issue I had is on two occasions my last round bolt hold open on my FN Scar 17 did not hold the bolt open. I’ve owned the rifle for over 3 years and never had this happen until I installed the BCD. If this persists I will contact them. I have no doubt they will work with me. The only reason I give it 4 over 5 stars is due to this issue. Now the BCD should actually add weight to my bolt release assisting it to catch the bolt easier… so I’m puzzled . Anyway I will shot more to see if it happens again