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Here's one to check out complete with adapter. https://f5mfg.com/product/modular-stock-system-for-czbren2-combo-with-tailhook-lower-adapter-black-copy/

Khanh, I highly recommend the A3 Tactical Folding Brace : -- https://a3-tactical-inc.myshopify.com/products/modular-side-folding-arm-brace-cz-bren

Khanh, A3 Tactical Folding Brace here >>> https://a3-tactical-inc.myshopify.com/products/modular-side-folding-arm-brace-cz-bren .....Have a great day!