---
title: CMMG Mk3 Platform Specifications
description: "Compatibility: CMMG Mk3 uppers typically compatible with lowers using LR308/SR25 pattern magazines. Not compatible with lowers using FAL magazines. Compatible with most DPMS Gen1 LR308 parts and acces"
---

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# CMMG Mk3 Platform Specifications

**Compatibility:**

CMMG Mk3 uppers typically compatible with lowers using LR308/SR25 pattern magazines.

Not compatible with lowers using FAL magazines.

Compatible with most DPMS Gen1 LR308 parts and accessories.

**Receiver Materials:** 

Uppers: – Billet 7075-T6 Aluminum

Lowers: – Billet 7075-T6 Aluminum

**Buffer Weight(s):**

Rifle (A1) – 5.4oz

Carbine – 3.9oz

**Bolt Carrier Group Materials:**

Bolt – Steel, 9310

Carrier – Steel, 8620

Extractor – Steel, S-7

Ejector – Steel, S-7

**Currently available in the following calibers:**

.308 Winchester (7.62x51mm NATO)

6.5 Creedmoor

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

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