Address: 1525 Mesa Verde E #105, Costa Mesa, California, 92626 Tel: 1.714.557.9822                 Custom Guns (Airsoft Guns)     Project Patriot-I: Basic: ECHO1 Model 4A1 + MadBull Patriot Kits (Long) Basic Plus: [Basic] + 6mm MadBull or Modify bearing/ bushing Economy: [Basic Plus] + MadBull M110 Spring Economy Plus: [Economy] + Modify piston. piston head, ball bearing spring guide Other upgrades, please contact us.     Project Patriot-I: Basic: ECHO1 Model 4A1 + MadBull Patriot Kits (Short) Basic Plus: [Basic] + 6mm MadBull or Modify bearing/ bushing Economy: [Basic Plus] + MadBull M110 Spring Economy Plus: [Economy] + Modify piston. piston head, ball bearing spring guide Other upgrades, please contact us.     Project JP Rifle Full handguard with 4 barrels: Basic: ECHO1 Model 4A1 + MadBull JP Kits (Full) Basic Plus: [Basic] + 6mm MadBull or Modify bearing/ bushing Economy: [Basic Plus] + MadBull M110 Spring Economy Plus: [Economy] + Modify piston. piston head, ball bearing spring guide Other upgrades, please contact us.     Project JP Rifle Mid handguard with 1 barrels: Basic: ECHO1 Model 4A1 + MadBull JP Kits (Full) Basic Plus: [Basic] + 6mm MadBull or Modify bearing/ bushing Economy: [Basic Plus] + MadBull M110 Spring Economy Plus: [Economy] + Modify piston. piston head, ball bearing spring guide Other upgrades, please contact us.     Project JP Rifle Carbine handguard with 4 barrels: Basic: ECHO1 Model 4A1 + MadBull JP Kits (Full) Basic Plus: [Basic] + 6mm MadBull or Modify bearing/ bushing Economy: [Basic Plus] + MadBull M110 Spring Economy Plus: [Economy] + Modify piston. piston head, ball bearing spring guide Other upgrades, please contact us.