Fits DM8 - DM15 Markers and all Reflex and Rail Markers. Detents Secured to Eye Pipe Designed for Durability and Easy Maintenance This self -contained detent system gives you long lasting reliability and peace of mind from double feeding. The new flex spring geometry holds paintballs securely in the breech without any unnecessary force that could threaten to affect your accuracy or break paint. Compatible with DM8-DM15 markers. Dye Precision, Inc U.S. Patent # 7,765,998