BudsGunShop.com - So rear connection is not Picatinny
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What IS the rear brace connection? Anything standard, or is it proprietary?
1 Answer

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The SIG Sauer MCX Rattler LT 5.56x45 NATO 7.75" Black M-LOK w/PCB Brace uses a Picatinny rail tail interface for attaching the brace. The brace itself is the Pistol Contour Brace (PCB), which is a folding, locking brace designed for more stability when used with a pistol. The PCB brace connects to the Picatinny rail tail on the Rattler