FIND IT HERE! https://doublemdefense.com/product/rugged-suppressors-piston-m13-5x1-lh-op004/ 

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Factory New.

UPC: 859383006303
SKU: OP004

Item Description:

Rugged Suppressors piston uses a non-slotted design creating a full circumference gas seal. This drastically lowers gas blowback for a more enjoyable shooting experience. Machined from 17-4 Stainless Steel and heat treated this piston is built to last. *When using a piston on a fixed barrel platform such as a carbine or subgun the spring must be replaced with a Fixed barrel spacer.

Item Specifications:

Brand Rugged Suppressor
Category Bolts & Pistons
Model Suppressor Piston
Finish Copper
Material 17-4 Stainless Steel
Hand Left
Thread Pattern M13.5×1 LH tpi