TM Hop-up Chamber Left Part for Marui MP9 Precision-machined left hop-up chamber designed as a direct replacement for the Tokyo Marui MP9. This OEM-compatible component maintains tight tolerances for stable BB spin and reliable feeding during rapid engagements. Engineered to enhance accuracy and ease of maintenance across CQB, milsim, and outdoor scenarios. Includes one chamber part finished in black. Verify your MP9 version before installation for optimal fit.