Whilst this is old news, of ICS taking a license from Action Sport Games to use the Brügger & Thomet (B&T) Trademakrs in their ICS MX5 (MP5) Series last year, they decided to officially name the MX5 Series into BT5 Series to fully recognise the use of the brand in their new MP5 AEG series. Perhaps it's name recognition and maximizing the B&T Brand, we don't know why they came to that decision.