
The rear sight looks to be similar to an M91 Carcano rifle.
The Shotgun News projects book has a how-to article describing making one of these.
Over the years, there have been all sorts of projects created by gunsmiths of varying degrees of talent.
Yes Martini and SMLE are the same. You have to remove about 1 thread from the SMLE barrel and cut the second extractor notch. The harder part is replacing the breechface, reducing the firing pin hole and making a new firing pin.
Starting with a .303 Martini avoids dealing with the block face conversion - it is already done, with a dovetailed bar across the face.



























