Smart Parts has been making high end regulators for professional paintball players around the world for many years. This is the first screw in system they have offered and it is amazing. The threads are made from stainless steel to prevent seizing up to your on/off or dovetail adapter. The pin area has been broached to accept an allen wrench which makes taking off the regulator a breeze to comply with TSA regaultions for flying. 100% made in the USA and easily rebuildable!