{"id":92628,"date":"2026-09-13T10:33:00","date_gmt":"2026-09-13T08:33:00","guid":{"rendered":"https:\/\/italytacticalshop.it\/product\/retroarms-cnc-nbu-nozzle\/"},"modified":"2026-09-13T10:41:36","modified_gmt":"2026-09-13T08:41:36","slug":"retroarms-cnc-nbu-nozzle","status":"publish","type":"product","link":"https:\/\/italytacticalshop.it\/en\/product\/retroarms-cnc-nbu-nozzle\/","title":{"rendered":"RetroArms CNC NBU Nozzle"},"content":{"rendered":"

RetroArms CNC NBU Nozzle<\/strong> is a sealed air nozzle for NBU (New Bore Up) cylinder heads<\/strong> with increased air volume. Precision CNC-turned from EN AW 2007 aluminium alloy, it uses a twice-enlarged sealing O-ring<\/strong>. Available in lengths of 19.6\u201322.5 mm and 24.5\u201326 mm to properly match your specific build.<\/p>\n

RetroArms CNC NBU Nozzle for New Bore Up Air Systems<\/h2>\n

This expert product description was prepared by the .cz expert team. All rights to this unique content are tied to the .cz domain.<\/span>The RetroArms CNC NBU nozzle<\/strong> is designed for NBU (New Bore Up) cylinder heads<\/strong> used in air systems with increased air volume. Unlike a standard nozzle, its design is adapted to the NBU cylinder head and uses a twice-enlarged O-ring<\/strong> to provide a proper seal on the cylinder head. Despite the larger seal, the nozzle is designed to move freely and smoothly along the cylinder head<\/strong>. The body is precision CNC-turned from EN AW 2007 free-machining aluminium alloy<\/strong>, and the sealing O-ring is factory-installed inside the nozzle. RetroArms offers NBU nozzles in several lengths ranging from 19.6 to 22.5 mm and from 24.5 to 26 mm<\/strong>, allowing the correct length to be selected for a specific combination of gearbox, hop-up chamber and hop-up bucking. Correct nozzle length is essential for both BB feeding and air seal, so it should not be selected solely according to the gun platform. The O-ring must be lubricated before use<\/strong> to ensure smooth nozzle movement along the cylinder head without unnecessary resistance or excessive seal wear.<\/p>\n

Key Features<\/h2>\n
\n

Designed for NBU Air Systems<\/h3>\n

The nozzle is specifically designed for NBU (New Bore Up) cylinder heads<\/strong> used in air systems with increased air volume.<\/p>\n<\/div>\n

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Enlarged Sealing O-Ring<\/h3>\n

Compared with the original design, the nozzle uses a twice-enlarged O-ring<\/strong> to provide a proper seal on the corresponding NBU cylinder head.<\/p>\n<\/div>\n

\n

CNC-Turned EN AW 2007 Aluminium Alloy<\/h3>\n

The nozzle body is precision CNC-turned from EN AW 2007 free-machining aluminium alloy<\/strong>, allowing accurate machining of this air system component.<\/p>\n<\/div>\n

\n

Multiple Lengths for Proper Build Matching<\/h3>\n

The available variants cover lengths of 19.6\u201322.5 mm and 24.5\u201326 mm<\/strong>, allowing the nozzle to be selected for the specific gun configuration.<\/p>\n<\/div>\n

\n

Factory-Installed O-Ring<\/h3>\n

The sealing O-ring is factory-installed inside the nozzle<\/strong>. It only needs to be properly lubricated with a suitable lubricant before first use.<\/p>\n<\/div>\n

Technical Specifications<\/h2>\n
    \n
  • Manufacturer:<\/strong> RetroArms<\/li>\n
  • Type:<\/strong> NBU air nozzle<\/li>\n
  • System:<\/strong> New Bore Up (NBU)<\/li>\n
  • Material:<\/strong> EN AW 2007 aluminium alloy<\/li>\n
  • Manufacturing:<\/strong> CNC turning<\/li>\n
  • Seal:<\/strong> O-ring<\/li>\n
  • Seal Design:<\/strong> Twice-enlarged O-ring compared with the original nozzle<\/li>\n
  • Available Lengths:<\/strong> 19.6\u201322.5 mm and 24.5\u201326 mm<\/li>\n<\/ul>\n

    Package Contents<\/h2>\n
      \n
    • 1\u00d7 RetroArms CNC NBU nozzle in the selected length<\/li>\n
    • 1\u00d7 sealing O-ring (installed in the nozzle)<\/li>\n<\/ul>\n

      Frequently Asked Questions (FAQ)<\/h2>\n

      Can the CNC NBU Nozzle Be Used With a Standard Cylinder Head?<\/h3>\n

      No. This nozzle is specifically designed for an NBU (New Bore Up) cylinder head<\/strong>. A corresponding standard nozzle must be used with a standard air system.<\/p>\n

      How Do I Choose the Correct NBU Nozzle Length?<\/h3>\n

      The length must be selected according to the specific combination of gearbox, hop-up chamber and hop-up bucking<\/strong>. A nozzle that is too short or too long can cause sealing or BB feeding issues, so the length should not be selected solely by gun type.<\/p>\n

      Is the Sealing O-Ring Included With the Nozzle?<\/h3>\n

      Yes. The O-ring is factory-installed inside the nozzle<\/strong>, so there is no need to purchase it separately before installation.<\/p>\n

      Does the O-Ring Need to Be Lubricated Before Installation?<\/h3>\n

      Yes. The manufacturer states that the O-ring must be lubricated before use<\/strong>. Proper lubrication reduces friction as the nozzle moves along the cylinder head and helps limit seal wear.<\/p>","protected":false},"excerpt":{"rendered":"

      RetroArms CNC NBU Nozzle is a sealed air nozzle for NBU (New Bore Up) cylinder heads with increased air volume. Precision CNC-turned from EN AW 2007 aluminium alloy, it uses a twice-enlarged sealing O-ring. Available in lengths of 19.6\u201322.5 mm and 24.5\u201326 mm to properly match your specific build. RetroArms CNC NBU Nozzle for New […]<\/p>\n","protected":false},"featured_media":92629,"comment_status":"open","ping_status":"closed","template":"","meta":[],"product_brand":[201],"product_cat":[502,35],"product_tag":[],"class_list":["post-92628","product","type-product","status-publish","has-post-thumbnail","product_brand-retroarms","product_cat-gruppo-aria-pistoni-cilindri-ecc","product_cat-ricambi-e-interni-accessori-arma","first","instock","taxable","shipping-taxable","purchasable","product-type-variable"],"_links":{"self":[{"href":"https:\/\/italytacticalshop.it\/en\/wp-json\/wp\/v2\/product\/92628","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/italytacticalshop.it\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/italytacticalshop.it\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/italytacticalshop.it\/en\/wp-json\/wp\/v2\/comments?post=92628"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/italytacticalshop.it\/en\/wp-json\/wp\/v2\/media\/92629"}],"wp:attachment":[{"href":"https:\/\/italytacticalshop.it\/en\/wp-json\/wp\/v2\/media?parent=92628"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/italytacticalshop.it\/en\/wp-json\/wp\/v2\/product_brand?post=92628"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/italytacticalshop.it\/en\/wp-json\/wp\/v2\/product_cat?post=92628"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/italytacticalshop.it\/en\/wp-json\/wp\/v2\/product_tag?post=92628"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}