G 17G4, 19G4, 19 (Marui) CNC 6063 Aluminium Ultra-light Blowback Housing

This CNC aluminium blow-back housing (BBU) is made by precision CNC machines with electroplating finishing.  It fits Marui G17 Gen.4, G19 Gen.4 and G19 GBB pistols.  The dimension is basis on original Marui blow-back housing, and it is modified with light weight and Double Ring System for professional and competition needs:

1) increasing the blow-back and recoil speed;
2) increasing gas-tightness with loading nozzle;
3) reducing recoil shock for increasing precision and faster repeat shooting (e.g. double/triple tag);
4) ensuring loading nozzle inline with hop-up.