Distar M16x1/2 GAS Adapter
https://puregroup.eu/shop/267621-distar-m16x1-2-gas-adapter-1514
https://puregroup.eu/web/image/product.template/1514/image_1920?unique=7eb285d
Outer thread 1 1/4 UNC, outer thread 1/2 GAS.
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