Geissele firing pin latch designed as a drop-in replacement for the SIG MCX bolt carrier group. Machined from hardened steel and finished for corrosion resistance, this latch provides positive engagement with the firing pin to prevent rotation or unintended movement during firing. Built to tight tolerances for reliable fitment and long-term durability, it helps maintain consistent primer strikes and improves overall BCG reliability under repeated use. Ideal for maintenance, repair, or performance-minded builds — recommended to be installed by a qualified armorer or experienced technician.
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