Is it this puppy? M&P Striker Channel Liner, All Except 45 & 45C [1717] - $1.75 : Welcome to Speed Shooter Specialties

S&W with their policy change in what parts they now require to be fitted/installed at the factory, and no longer sell them directly to the public, might make this unavailable to you from S&W.

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Conrad
SWCA #1830 SWHF #222