Addax Tactical GPU (Gas Piston Upper)
The Addax GPU (Gas Piston Upper) from Addax Tactical is a series of complete uppers utilizing the Primary Weapon Systems (PWS) AR-15 gas piston conversion system combined with high-quality AR-15 parts and components. Addax Tactical is a certified PWS gas system conversion installer, but they wanted to take it a step further. Instead of only assembling components into complete uppers, Addax has been working with PWS to make some refinements to the system which are seen here on their Combat GPU.