SDS Imports Tokarev USA TX3 12EXTM One Round Magazine Extension Tsunami 30CE8047 SDTX312EXTM. Tokarev Arms TX3 12EXTM- 1 Round Magazine Extension for the TX3 12HDM Shotgun- Increases Magazine Tube Capacity to 5+1- Nickel Marine Finish Features of SDS Imports Tokarev USA TX3 12EXTM One Round Magazine Extension Tsunami: Increases Magazine Tube Capacity to 5+1 Nickel Marine Finish Package Contents: SDS Imports Tokarev USA TX3 12EXTM One Round Magazine Extension Tsunami Tokarev Arms TX3 12EXTM- 1 Round Magazine Extension for the TX3 12HDM Shotgun- Increases Magazine Tube Capacity to 5+1- Nickel Marine Finish SDTX312EXTM