{"id":18088,"date":"2022-07-07T17:02:22","date_gmt":"2022-07-07T15:02:22","guid":{"rendered":"https:\/\/repairsoft.be\/?post_type=product&#038;p=18088"},"modified":"2026-04-17T16:32:09","modified_gmt":"2026-04-17T14:32:09","slug":"maxx-cnc-aluminum-hopup-chamber-m4p-pro","status":"publish","type":"product","link":"https:\/\/repairsoft.be\/en\/shop\/maxx-cnc-aluminum-hopup-chamber-m4p-pro\/","title":{"rendered":"Maxx CNC Aluminum Hopup Chamber M4P &#8211; PRO"},"content":{"rendered":"","protected":false},"excerpt":{"rendered":"<h2>Maxx<\/h2>\n<p>CNC Aluminum Hopup Chamber M4P Pro (with BB Latching System) unit is precisely machined to perform accurately and consistently with HPA\u00a0<a title=\"Go to PolarStar Airsoft\" href=\"https:\/\/polarstarairsoft.com\/\" target=\"_blank\" rel=\"noopener\">PolarStar<\/a>\u00a0Engines on standard M4\/M16 platform.<br \/>\nThe Hopup Chamber M4P unit is built with an aluminum Rotary Dial Knob for fine hopup adjustments, the precision Hopup Lever and 4mm\u00a0<a title=\"Go to Bucking Nubs\" href=\"https:\/\/www.maxxmodel.com\/index.php?category_id=0&amp;search=nub&amp;submit_search=&amp;route=product%2Fsearch\" target=\"_blank\" rel=\"noopener\">Bucking Nubs<\/a>\u00a0(6mm\u00a0<a title=\"Go to Bucking Nubs\" href=\"https:\/\/www.maxxmodel.com\/index.php?category_id=0&amp;search=nub&amp;submit_search=&amp;route=product%2Fsearch\" target=\"_blank\" rel=\"noopener\">Bucking Nubs<\/a>\u00a0are optional) to perform best with R-Hop and Standard-Hop to keep the BB shooting accurately and consistently on every single shot.<br \/>\nThe Hopup Chamber M4P unit is designed to accept the HPA\u00a0<a title=\"Go to PolarStar Airsoft\" href=\"https:\/\/polarstarairsoft.com\/\" target=\"_blank\" rel=\"noopener\">PolarStar<\/a>\u00a0Engine M4 nozzle length, and fully compatible with most aftermarket soft and hard rubber buckings without losing FPS or dropping BB during use.<br \/>\nThe Hopup Chamber M4P unit is wisely equipped with an interchangeable\u00a0<a title=\"Go to Inlet Adaptor\" href=\"https:\/\/www.maxxmodel.com\/index.php?category_id=0&amp;search=inlet+adaptor&amp;submit_search=&amp;route=product%2Fsearch\" target=\"_blank\" rel=\"noopener\">Inlet Adaptor<\/a>\u00a0OD11mm to ensure the hopup unit is inserted exactly in the center of the 11mm inner bore HPA Engine nozzle outlet without wobbling. (<a title=\"Go to Inlet Adaptor\" href=\"https:\/\/www.maxxmodel.com\/index.php?category_id=0&amp;search=inlet+adaptor&amp;submit_search=&amp;route=product%2Fsearch\" target=\"_blank\" rel=\"noopener\">Inlet Adaptor<\/a>\u00a0OD11.5mm and OD12mm are optional)<br \/>\nAlso mounted the removable CNC Brass Side Wings to slide smoothly into the outer barrel slots, and included an advanced CNC Delrin Locking\u00a0<a title=\"Go to C-Clip\" href=\"https:\/\/www.maxxmodel.com\/hopup-chamber-delrin-c-clip-for-maxx-hopup-series.html\" target=\"_blank\" rel=\"noopener\">C-Clip<\/a>\u00a0to hold the inner barrel tight in place without wobbling and twisting.<br \/>\nMore than that, the Hopup Chamber M4P Pro unit is specially designed with a new BB Latching System to prevent BB dropping after removing the magazine. The Latching Arm can also be manually pressed to release the remaining BB from inside the hopup chamber.<\/p>\n<p>***The Dual UV LED Tracer Module is an add-on option to glow BB in the dark. Operating Voltage from 7VDC &#8211; 15VDC (2-4 cells LiPo, 6-13 cells NiCad). (Sold separately)<br \/>\n***Test results: FPS might be increased from 10FPS to 30FPS over the stock setup. Please check your FPS!<\/p>\n<p>&nbsp;<\/p>\n<table border=\"0\" width=\"100%\" cellspacing=\"0\" cellpadding=\"1\">\n<tbody>\n<tr>\n<td valign=\"top\" bgcolor=\"#cccccc\" width=\"14\"><\/td>\n<td bgcolor=\"#cccccc\"><strong>Includes<\/strong><\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x CNC Aluminum Hopup Chamber M4P Pro (with BB Latching System) unit<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>2 x CNC Acrylic Side Cover<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>2 x CNC Brass 2.5mm Side Wing<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x CNC Steel Pivot Pin<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x CNC Aluminum Hopup Lever<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x CNC Aluminum Soft Round Nub<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x CNC Aluminum Soft Flat Nub (4mm)<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x CNC Aluminum Hard Concave Nub (4mm)<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>3 x Steel Nub Spring<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x CNC Steel Spring Guide<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x Steel Upper Compression Spring<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x Steel Center Compression Spring<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x CNC Delrin Locking C-Clip<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x CNC Brass Barrel Spacer<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x Brass Barrel Spacer Holder Oring<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x CNC Aluminum Rotary Dial Knob<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>1 x CNC Aluminum Inlet Adaptor (OD11mm)<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<table border=\"0\" width=\"100%\" cellspacing=\"0\" cellpadding=\"1\">\n<tbody>\n<tr>\n<td valign=\"top\" bgcolor=\"#cccccc\" width=\"14\"><\/td>\n<td bgcolor=\"#cccccc\"><strong>Specification<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<table border=\"0\" width=\"100%\" cellspacing=\"0\" cellpadding=\"1\">\n<tbody>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Overall Length: 51.15mm<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Overall Height: 37.75mm<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Inlet Adaptor Outer Diameter (to fit into HPA Nozzle Outlet): 11mm<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Hub Outer Diameter (to fit into Outer Barrel): 12mm<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Hub Inner Diameter (to fit Nozzle): 8mm<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Feeder Outer Diameter (to fit magazine): 8.85mm<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Feeder Length (to fit magazine): 6mm<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Material: Aluminum 6061<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>&nbsp;<\/p>\n<table border=\"0\" width=\"100%\" cellspacing=\"0\" cellpadding=\"1\">\n<tbody>\n<tr>\n<td valign=\"top\" bgcolor=\"#cccccc\" width=\"14\"><\/td>\n<td bgcolor=\"#cccccc\"><strong>Features<\/strong><\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Machined from a solid aircraft aluminum block with tight tolerances to achieve the most accuracy, consistency, and durability<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Performed accurately and consistently with HPA PolarStar Engines on standard M4\/M16 platform<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Precision Rotary Dial Knob for fine hopup adjustments<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Re-engineered the precision Hopup Lever and 4mm Bucking Nubs (6mm Bucking Nubs are optional) to perform best with R-Hop and Standard-Hop to keep the BB shooting accurately and consistently on every single shot<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Removable Steel Pivot Pin for ease of setup and maintenance<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Accepted the HPA PolarStar Engine M4 nozzle length<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Fully compatible with most aftermarket soft and hard rubber buckings without losing FPS or dropping BB during use<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Wisely equipped with an interchangeable Inlet Adaptor OD11mm to ensure the hopup unit is inserted exactly in the center of the 11mm inner bore HPA Engine nozzle outlet without wobbling. (Inlet Adaptor OD11.5mm and OD12mm are sold separately)<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Mounted the removable CNC Brass Side Wings to slide smoothly into the outer barrel slots<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Included an advanced CNC Delrin Locking C-Clip to hold the inner barrel tight in place without wobbling and twisting<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Equipped with 2 compression springs on top and center to ensure the hopup unit is seated straight and air tight during use<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Specially designed with a new BB Latching System to prevent BB dropping after removing the magazine<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>The Latching Arm can also be manually pressed to release the remaining BB from inside the hopup chamber<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>Compatible with any 11mm inner bore HPA Engine nozzle outlets<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"14\"><img decoding=\"async\" src=\"https:\/\/www.maxxmodel.com\/image\/catalog\/product_right_arrow.png\" width=\"14\" height=\"14\" border=\"0\" \/><\/td>\n<td>The Dual UV LED Tracer Module to glow BB in the dark ready!<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":18089,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"product_brand":[],"product_cat":[93,224,92],"product_tag":[],"class_list":{"0":"post-18088","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-aeg-upgrade-parts","7":"product_cat-hop-up-aeg-upgrade-parts","8":"product_cat-upgrade-parts","10":"first","11":"instock","12":"taxable","13":"shipping-taxable","14":"purchasable","15":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/repairsoft.be\/en\/wp-json\/wp\/v2\/product\/18088","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/repairsoft.be\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/repairsoft.be\/en\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/repairsoft.be\/en\/wp-json\/wp\/v2\/comments?post=18088"}],"version-history":[{"count":1,"href":"https:\/\/repairsoft.be\/en\/wp-json\/wp\/v2\/product\/18088\/revisions"}],"predecessor-version":[{"id":18091,"href":"https:\/\/repairsoft.be\/en\/wp-json\/wp\/v2\/product\/18088\/revisions\/18091"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/repairsoft.be\/en\/wp-json\/wp\/v2\/media\/18089"}],"wp:attachment":[{"href":"https:\/\/repairsoft.be\/en\/wp-json\/wp\/v2\/media?parent=18088"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/repairsoft.be\/en\/wp-json\/wp\/v2\/product_brand?post=18088"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/repairsoft.be\/en\/wp-json\/wp\/v2\/product_cat?post=18088"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/repairsoft.be\/en\/wp-json\/wp\/v2\/product_tag?post=18088"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}