Sig Sauer MCX Firing Pin Lock Spring. Crafted from sturdy steel, this firing pin lock spring is for the Sig Sauer MCX rifles chambered in .223, 5.56x45mm and .300 Blackout. The firing pin lock spring is resposible for retaining the firing pin lock plunger via contained tension.
- Caliber: .223 Rem,5.56x45mm,.300 Blackout
- Finish / Color: Unfinished
- Firearm Type: Rifle
- Material: Steel
- Models Fit: Sig Sauer MCX
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