I installed the charging handle and a safety lever yesterday. Can’t say I was impressed with the supplied spiral roll pins. Had difficulty getting them in (they actually started unraveling and otherwise refused to fit in their holes, so went back to the original CZ pins, which went in just fine. Not sure if it is a size or quality issue with the HBI pins, but they absolutely would not go in right. Maybe if the pin holes were chamfered a bit more, the supplied pins would go in easier. So don’t throw away your original pins if you do this mod.