Almost anything can be fixed if you want to badly enough... but that said, the gun in question has been messed with repeatedly. It's collector value is trashed. The cost of repair exceeds the value of the piece... by far! If repaired / rebuilt it's value would never be enough to recoupe the costs. If it could be bought at salvage value, the equation would be different. My advise would be to make a salvage value offer or walk away. You can buy an intact piece (for twice the money) and you'll come out ahead.

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NRA LIFE
Reserve Officer 9yrs