Our Competition Bolt with DLC Coating is ensures smooth operation and functioning whether its a day of plinking at the range or competing at the highest level. The Black Mamba build utilizes a Ruger MK IV 22/45 frame that has been retrofitted with our Accurizing Kit providing a crisp, clean 2.2 lb trigger pull. The frame has also been fitted with our magazine release that, when used in conjunction with our magazine base pads (included standard), eliminates feeding issues. This is accomplished by raising the magazine's position in the frame, allowing the bolt to more positively engage each round as it feeds.