@MattH and @12boreman,
Thank you for the reply. This all makes sense now. Yes the lifter action is very interesting indeed and as the lifter is raised it retracts the firing pins. As you can see the gun has been restored and the barrels were sleeved with London nitro proof. So from a collector perspective not so good. But from a shooting perspective, I love it. BTW whoever did the sleeving did a great job as you cannot hardly even see a seam.