KWA’s Gen 2 Upper Receiver for the KWA LM4 Series Gas Blowback Rifles replaces the multi-piece outdated version. The new one-piece receiver can easily mount much larger and heavier optics and scopes without the worry of breaking or seperating the upper picatinny/weaver rail. This genuine KWA manufactured product is made from durable, lightweight aluminum. The dust cover and forward assist are also included.