It’s heavy, the bolt action handle will not hold a magnet but the rest of the device does. It appears as though the handle may have been drilled and tapped and there may be a set screw? Could also just be a blemish? The pin that pushes the ammo in to firing position is magnetic. This was found in very shallow fresh water creek.
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The presented object appears to be the bolt action device made out of cast metal with the rest of a wooden part. It is questionable if this piece was a part of a rifle or small-caliber cannon. The metal itself appears not to be steel or iron which has to be the consistency to resist the explosion of a shot. It is possible this is a part of an agricultural machine or something similar. Even if this would be a part of a rifle or small-caliber cannon it would not be interesting for a collector or potential buyer.
A fair market estimation would be between 0 to 10 USD.
This estimate is based on actual recent past recorded auction sales of comparable items. Retail "asking prices" can be higher and may vary.
With kind regards,