mossberg for western auto
50-350 usd
You will have to call Mossberg
10-700 USD depending on specifics
I can supply half the answer (the easy half) Mossberg made this firearm as with most Western Field firearms.It was the Mossberg model 800A and was made from 1967-1972.
Mossberg
50-500 depending on specifics.
Well to be honest im a Marlin Man and a Certified Gunsmith,however while the Marlin has a worse trigger pull than the Remmy,i've seen more burnt out barrels from the Remingtons than any other guns,while my my Marlin 336's and 308mx see action at the range constantly.The Mossberg will be the first to have the parts to become obsolete.Accuracy is a toss-up between the XS7 and 700 SPS,while I know they're both capable of taking the Mossberg,due to it has the worst chamber reaming and head spacing of the other two.Im gonna go with the Marlin with the aftermarket RifleBasix Trigger....
Anything made by any other maker that has similar features.
mossberg 595 bolt
Your rifle is a Mossberg 800A. Some parts may be available from Mossberg, some are available for gunpartscorp thru their website, and some may be available thru havlinsales at their website. Good luck!
Local gunsmiths, gun shows, e-gunparts.com, Mossberg... those are the places to try first.