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Product Details
Product Features & Specifications CMMG 55CA9CB Receiver Extension Castle Nut Black Matte MK4 M4 / AR Castle Nut, Receiver Extension (Buffer Tube) castle nut. Matte black finish. Brand CMMG Series Castle Nut Model Receiver Extension Firearm Fit MK4 Color Black Finish Matte SKU 1753
- Brand
- Cmmg
- SKU
- 88227