As mentioned the bolt carrier is made well, the aluminium part does need some work with a file but that was known before purchase so its completely fine. However the provided O-rings for the nozzle are too thin and do not seal at all, resulting in horrible efficiency (cant go trough one mag on semi due to cooldown). Stock O-ring obviously does not fit, hence the provided replacement, so i will have to look for a replacement somewhere.
A big pro for me tho is that this BCG gets rid of the characteristic ping sound of the nozzle returning in the stock BCG, so if this toy-like sound annoys you too then maybe give this product a shot, just you might need some new O-rings.
