FIND IT HERE! https://doublemdefense.com/product/rugged-piston-m14-5x1lh-piston-op008/

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Factory New.
UPC: 859383006341
SKU: OP008
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 Hand Left Material 17-4 Stainless Steel Finish Copper Thread Pattern M14.5×1 LH