Rifle was purchased new around 1979. Over the years its had very small bits broken off of the piece in the middle of the attached pic. It still functions, but I'd like to have the broken part replaced.
I've looked at Numrich schematics for both "old" and "New" models. I'm not certain if this qualifies as an old or new model. It appears to me to most closely resemble the "Hammer, New Style" here Hammer, New Style Gun Parts | 444040D | Numrich Gun Parts
Is this a correct part id? If not, can someone tell me what is this broken part? Will the part listed in the above link work in both "Old" and "New" models? (No available part was listed under the "old" schematic.)
And finally, is this something I might be able to take to a gunshop to have replaced or would I need to find someone special to repair this?