UAC is a Hong Kong brand that specifies in the production of competition modification parts for airsoft guns, and due to the popularity of the TM M4 MWS series, they have introduced the Enlarged bolt stop, Enlarged Ambi-Magazine Catch, Ambi-Selector and a Race Trigger. All of the items are constructed with aluminium so they would be light weight and durable.

The Match Trigger is constructed from lightweight aluminium and provides a slim, lightweight and trimmed new design trigger is the key to provide a crispy trigger press and speed shooting.