I believe in having some spares parts for any gun you take to the field in the form of a spare firing pin, spare return springs(if needed) and a spare mag(s). Other items I include are a good field cleaning kit and the hex keys/screwdrivers needed to change out vital parts and to retighten bipod leg mounts or scope mounts.
If you take care of a gun properly in the field you will never really need more than that to have it stay serviceable and last a very long time. If you can get a gun plumber to mount a weaver type rail to your reciever you can quickly attach or dismount a scope if needed. It is best to leave a scope undisturbed but if you mount it in the same place every time and do not disturb the dial settings you will be plenty accurate for hunting or plinking. This may be an alternative to buying a whole new reciever.
Try the "western gun parts" store in Edmonton and you should find these things for any gun you need.
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