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 Ambi Selector enables selecting your firing mode on both sides and was designed with a long and a short selector which suitable for both left and right handed shooters, allow you to choose which one is more suitable for your needs. It is in modular design and more style is coming.