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picatinny screw size

  1. Picatinny Base screw size.

    I bought a 10 inch picatinny base and it came with screws I can't identify. Pitch is not 48 or 32 but the major diameter is .154 inches. Anybody have a clue what they are? The donor action for the build I'm starting already has holes that match this thread so I'd like to stay with the same screw...