Rival Arms Match Grade Drop-In Barrel, V1, For Gen 3/4 Glock 19, 9MM, 1:10 twist, Black Physical Vapor Deposition (PVD) Finish RA-RA20G201A It's no secret that the key to great accuracy is good training. After that" it often comes down to a match-grade barrel. Built from high-quality stainless steel" precision polished" and treated with premium coatings" these barrels rival custom work and deliver the best in accuracy and performance" round after round.