Ultimate Airsoft Custom (UAC) sent in their latest product release, the UAC Lightweight Blowback Housing for TM G17 V2... "Constructed by one piece 6061 Aluminum. Advanced O-ring system is used while remain lightweight at only 19g. Provide smooth and fast blowback cycle. Designed and fit for standardize UAC-TM-00029 O-ring and easy for maintenance. Compatible for stock / reinforced plastic nozzle and work best with UAC aluminum nozzle.

*PS: Please note: installing parts / assemble /fitting airsoft gun will need intermediate knowledge; for expert or airsoft gunsmith. Please refer to your airsoft gunsmith for proper installation / fitting. Fitting may be needed as the condition of each airsoft gun might be different. Regular maintenance is needed for all airsoft guns in order to keep it in good working condition and reduce wear out issue on parts."