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The KVP 9mm Bolt Carrier Group is constructed from US made 8620 steel and features a Nitride QPQ finish. This QPQ finish offers superior wear and weather resistant properties when compared to traditional phosphate finishing. The firing pin retention spring is considerably thicker which will reduce the chance of firing pin breakage which has been seen with lesser bolt carrier groups.
Note: Many aftermarket drop in triggers use modified hammers and can be temperamental in blowback systems. For the most consistent results a mil-spec fire control group is recommended. However, in KVP's testing, these aftermarket fire control groups should work in most circumstances: POF, Hiperfire EDT and 24 Series, Geissele, Timney, Rock River, and Spikes.