Our innovative design overcomes the challenge posed by limited chamber space and the need for a large tube inside diameter for effective brush clearance. Traditional chamber sealing O-rings were not an option, so we've engineered a solution by incorporating a front brass bushing. This bushing precisely centers the guide within the barrel extension and securely rests against the chamber opening for optimal alignment. Additionally, a large O-ring on the rear end locks into the bolt opening at the receiver's rear, minimizing longitudinal movement and ensuring stability throughout the cleaning process. This design enhances cleaning efficiency while maintaining precision.