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CMMG .308 Lower Receiver Parts Kit

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90 Day No-Hassle Returns We Pay Return Shipping

We have a 90-day no-hassle return policy. We pay return shipping.

If you need to request a return, contact us at support@at3tactical.com and we will send you a return label

After 90 days, defective items will still be covered under the manufacturer’s warranty, where applicable.

Please refer to the product listing for warranty details. If you have specific warranty questions, contact us at support@at3tactical.com. We may direct you to pursue your warranty claim directly with the manufacturer.

Your satisfaction is our #1 priority

If you’re dissatisfied with your purchase, in any way, please contact us at support@at3tactical.com – we will do our best to make it right.

Fast & Free Shipping On orders over $50

You will receive fast, free shipping for all orders over $50

Shipping cost is $7.99 for orders under $50. We ship with UPS or USPS, depending on the item.

Most orders received by 1pm CST ship the same day

You will receive an email with tracking information at the time of shipment. To expedite shipping, we may ship your order from multiple warehouses. Orders placed on weekends, holidays, or after 1pm will ship the following business day.

All the Parts You Need to Get Started on Your Next Mk3 Build

Combine this kit with a buttstock kit to complete your lower group. Compatible with CMMG Mk3 Lowers and most LR308 type lowers.

All parts meet or excede mil-spec.

The CMMG Lower Parts Kit for the MK3 contains 4 color-coded bags:

  • The Clear bag contains the .308 takedown pin. .308 receiver pivot pin, two (2) takedown pin detent, two (2) takedown pin detent springs.
  • The Yellow bag contains the bolt catch, bolt catch plunger, both catch screwm bolt catch spring, buffer retainer, and buffer retainer spring.
  • The Red bag contains two (2) hammer and trigger pins, hammer spring, trigger spring, disconnect, and disconnect spring.
  • The Blue bag contains the magazine catch, magazine catch spring, and magazine release button.
  • The Green bag contains the safety selector, selector detent, selector detent spring, lock washer, and pistol grip screw.
  • Hammer, trigger and pistol grip also included

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