|  Celcius Hopup Chamber Base for CTW / Systema PTW and compatible series AEG Rifle Material: Zinc Alloy / Metal Manufacture: Celcius Net Weight: 37.5g Length: 46.61mm Diameter: 23.99mm Item Part#: BRL-021 Compatible: with M4, M4 CQB, M16A2, M16A3 CTW / PTW & compatible training weapons. |