The Crimson NPAS is an adjustable power valve designed for a huge range of VFC, APFG and Maruyama GBBRs, giving you an easy way to fine-tune your rifle's FPS and Joule output. Developed with a tighter internal bore, the Crimson NPAS is designed to improve shot-to-shot consistency, particularly around the 0.9–1.2J range commonly used at UK airsoft sites. Once fitted, adjustment is made through the front of the nozzle using a 1.5mm hex key. Turn clockwise to reduce power and counter-clockwise to increase it, making it much easier to get your GBBR where you need it for different site limits, BB weights and conditions. Made from a strong nylon polymer in Crimson's unmistakable red finish, it's a small upgrade that can make a big difference to the usability of your GBBR. Key Features Adjustable NPAS power valve Allows FPS / Joule output adjustment 1.5mm hex key adjustment Clockwise reduces power Counter-clockwise increases power Tighter internal bore designed to improve consistency Particularly effective around 0.9–1.2J Strong nylon polymer construction Distinctive Crimson red finish Compatible with a wide range of VFC GBBRs Compatible with APFG MCX & MPX GBBRs Compatible with Maruyama ISO 556 Compatible with Maruyama APC9, SCW9 & SPC9 Ideal for keeping your GBBR within site power limits A full list of all compatible replicas below: - VFC URGI GBBR (all variants) - VFC 416 GBBR (all variants) - VFC BCM GBBR (all variants) - VFC SR-16 GBBR (all variants) - VFC AK GBBR (all variants) - VFC 727 GBBR - VFC M933 GBBR - VFC M733 GBBR - VFC M16A1 / M16A2 GBBR - VFC XM177E2 GBBR - VFC MP7 GBBR - VFC SR25 / M110 GBBR- VFC SCAR-H GBBR (all variants) - VFC 417/G28 GBBR - VFC PSG1 GBBR- VFC T91 GBBR (all variants) - VFC G36 GBBR (all variants) - VFC G3 / HK53 GBBR - VFC FAL / OSW GBBR - VFC FNC GBBR (all variants) - VFC UMP45 / UMP9 GBBR - VFC PPSH GBBR - APFG MCX GBBR (all variants) - APFG MPX GBBR (all variants) - Maruyama ISO 556 GBBR - Maruyama APC9 / SCW9 /SPC9 GBBR (all variants) - Marksman K1A GBBR