Specna Arms Magnus™ TDC Rotary Chamber for M4/AR-15 AEGs

If you need a replacement or upgrade for your standard HOP-up unit, the Specna Arms Magnus™ TDC Rotary Chamber is the perfect choice for you! This HOP unit is identical to the ones that come preinstalled in the Specna Arms PRIME series. That means it also includes the Helium™ Flat HOP rubber, which helps keep your BBs shooting straight. The HOP-up unit is compatible with V2 gearboxes, meaning it will fit in almost all M4 or similar assault rifles. The chamber is made from high-density polymer and is an excellent solution if you are experiencing any HOP-related issues with your assault rifle.