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  1. SIG Sauer Rifles
    Can you use another brand's piston upper on an MCX lower? Such as an LMT, PWS or maybe a SIG 516 upper? I have an SBRed MCX lower for my Rattler. But seeing as how getting an 11.5 MCX upper is impossible, I figured I'd try to find another short-barreled piston upper to slap on and shoot 556...
  2. SIG Sauer Rifles
    For the life of me I just can't seem to find an MCX lower. Does anyone have any idea where I might be able to find one? I've been looking all over the internet, to no avail. Frustrating.
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