Acione SX 12ga front site bead

[Thomas Tagli]

I have a Acione SX 12 ga. Does anyone know what size the thread is? I am looking at replacing the white bead with a "Hiviz".

[birddog]

Thread: M3.0-.5

Franchi, Fabarm, H&K, the Browning Gold and Citori Field use it also. It is possible that any bead may have been retapped or they may have changed their thread dimensions.