---
title: CMMG Mk9 Platform Specifications
description: "Receiver Materials: Upper: Billet 6061-T6 Aluminum Lower: Forged 7075-T6 Aluminum Buffer Weight(s): Dedicated 9mm = 5.36oz (Dark grey/black, longer tham Mk4 Carbine buffer) Bolt Group Materials: Bolt"
---

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# CMMG Mk9 Platform Specifications

**Receiver Materials:**

Upper: Billet 6061-T6 Aluminum

Lower: Forged 7075-T6 Aluminum

**Buffer Weight(s):**

Dedicated 9mm = 5.36oz (Dark grey/black, longer tham Mk4 Carbine buffer)

**Bolt Group Materials:**

Bolt – Steel, 8620

Extractor – Steel, 4140

Fixed Ejector – Steel, 1070

Virtual Patent Information can be found [here](https://cmmg.com/patents).

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