{"product_id":"fps-soft-air-pistone-zero-shock-alleggerito-full-metal-rack14-denti-fps-made-in-italy-pm03-00","title":"FPS SOFT AIR lightweight zero shock piston full metal rack 14 teeth FPS Made in ITALY","description":"Fps is proud to present the first lightweight piston with a technopolymer body and all metal teeth, equipped with a ZERO-SHOCK damping system, 100% Made in Italy. \u003cbr\u003eThis system, patented by Fps, reduces the stress that the rack transmits to the piston body, making the assembly enormously more resistant and reliable compared to a normal piston.\u003cbr\u003eFor the body material, a technopolymer loaded with the addition of a small percentage of elastomer was studied, which provides high mechanical performance and a very low coefficient of friction.\u003cbr\u003eThe rack was manufactured using MIM (Metal Injection Molding) technology, as this production process guarantees dimensional precision and robustness virtually equal to those of machining from solid.\u003cbr\u003eThe rack comes with the second tooth missing and the third already lowered by 0.3 millimeters, as this configuration predisposes the piston for a correct Angle of Engagement (AOE) and makes it suitable for high rate of fire.\u003cbr\u003eThe type of metal injected is SAE 4650, surface treated with HRC38-42° hardening, which is currently considered the best material on the market for this type of use.\u003cbr\u003eThe guide rails are designed to minimize friction and retain lubricant for a long period of time. \u003cbr\u003eThe rack seat is off-center to facilitate the coupling between the piston teeth and the sector gear teeth.\u003cbr\u003eThe longitudinal reinforcements at the sides of the teeth increase the robustness of the piston and prevent contact between the rack and the inner wall of the cylinder. \u003cbr\u003eSpecial ribs reduce the contact surface between the spring and the inner part of the piston body, and consequently, the friction between metal and technopolymer is also reduced during contraction and extension due to the firing cycle.\u003cbr\u003e100% MADE IN ITALY\u003cbr\u003e100% MARUI COMPATIBLE\u003cbr\u003e","brand":"FPS SOFT AIR","offers":[{"title":"UN","offer_id":62053513560394,"sku":"PM0300-UNI","price":13.9,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1043\/8921\/4538\/files\/image_916c915b-5dec-493a-8f84-1ec57ce98074.png?v=1780935583","url":"https:\/\/www.military-surplus.it\/en\/products\/fps-soft-air-pistone-zero-shock-alleggerito-full-metal-rack14-denti-fps-made-in-italy-pm03-00","provider":" MILITARYSURPLUS","version":"1.0","type":"link"}