FIND IT HERE! https://doublemdefense.com/product/sco-alpha-dt-mount-5-8x24/ 

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Factory New.

UPC: 817272011500
SKU: AC634 

Item Description:

SilencerCo's interchangeable, modular thread adapter allows the Harvester 300 to be mounted on virtually any barrel. This direct thread mount has a 5/8x24 thread pitch and a black finish.
 

Item Specifications:

Brand SilencerCo
Category Suppressor Accessories
Series Direct Thread Mount
Model Harvester 300
Caliber 300 Win Mag
Material Stainless Steel
Thread Pattern 5 / 8"x24
Search Code SILENCE
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