AST contacted us and presented two new videos that I know you will all like. First video is about a new aluminium upper and lower receiver for GBB M4. Second video presents the steel bolt that upgrades the EMG.
RA-TECH new prototypes announce
- Licensed by Salient Arms International
 - Made from heat-treated medium carbon steel
 - Titanium Nitride (TiN) coating for superior surface-wear resistance
 - Nice heavyweight feel for more realistic handling and feedback
 - Bolt carrier keyway is held in place by 2x long thread heat-treated screws
 - Steel bolt catch included
 - Direct drop-in performance part, easy to install with minimal to no modification necessary
 - RA-TECH Aluminum nozzel with tool Adjust NPAS set
 - Compatibility: For WE M4/M16 series Airsoft GBB rifles
 - Material: Heat-treated, TiN coated medium-carbon steel
 - Package Includes: TiN Coated Steel Bolt, Steel Bolt Catch