This is the magazine ring (also called mag hanger) Winchester 1892 rifle in small caliber (25 and 32 cals etc),and model 53 It is take down version and does NOT have a pin hole in the base. On the take down versions the magazine tube screws into the takedown extension so it does not need a pin to hold the tube in. THIS RING IS STANDARD. IF YOU HAVE A LIGHT WEIGHT OR TAPER BARREL PLEASE SEE wp471.