Has the Troy TRX Extreme Battlerail been dicontinued?
Quote from the Troy website:
** Troy is upgrading the TRX Extreme to the Alpha Rail. Within the next 60 days, TRX Extreme purchases may be shipped with the upgraded Alpha Rail. **
Based on the Troy 2012 catalog, it seems the TRX Extreme has been discontinued. It appears the locking mechanism for the Alpha rail has changed also.
From the 2012 catalog: