NX1 - MARK 4 - Slide Frame - Purple Custom machined retro body Revolutionary quad ball detent system (stops closed bolt ball rollout) Custom profile machined back block 4 piece aluminum and Delrin bolt , provides resistance super smooth action while providing a air seal during firing. Internally intergraded spring and ball for the side push pin Wide Trigger Shoe Smooth Action On/Off T-Slot Bottom Line with front inline output Aluminum Hammer Kit w/ nylon lock screws . Insures once you have your lug set it stays set! Comes standard with NOVA Balance Pressure Valve & Ultra Lite Springs Lever Locking Feed neck and intergraded profile machined mount Low operating pressure Optimized front Block with stainless steel flush mount bolt Comes standard with REAPER barrel (uses NOVA bore kit) Two piece high tolerance micro honed and ported barrel. Nova Guardian vertical regular standard, feature 33 degree air-port and modular design for proper air line alignment . Nova hellfire internals for super fast repeatable performance Factory spring setup for guardian regulator velocity adjustment Optional front block gauge to monitor your pressure . If you don’t want it just let us know we will not install it. Free option ! Lifetime limited warranty PHASE 1 front block pneumatics Dual acting ram cylinder with front swivel integration for alignment and durability , front and back bumpers for smooth action and fast response. Streamlined LPR (low pressure regulator) designed for ease of adjustment with the turn of the front housing ,ultra-low pressure performance. Nova "Ménage à Trois" Auto-cocker 3-way w/ Timing rod and Collar Aluminum High Tolerance Super Short Stroke 3-Way w/ Stainless Steel Alignment Collar includes one barrel insert Optional Delrin Pump Handle, Pre-drilled for Hitman Plate adjustable spring tension return New design square pump stem Smooth inline motion with virtually zero side to side motion