CM4 5.56 Forged Lower Receiver

Typically Processes/Ships within 5 days from receiving FFL Copy - Assembly and Custom Cerakote Lead Times Vary (See Disclaimer Below)
(20 reviews) Write a Review

Centurion Arms LLC, C4 5.56 Forged Lower Receiver 7075-T6 Aircraft Grade Aluminum

Receivers Machined from Aluminum Forgings 7075-T6


*** We recommend gunsmith installation for all of our parts.  We cannot warranty items damaged by improper installation.

**FFL Required Before Shipping. Please have your dealer email their license to and have them reference your name/order number. 

No we do NOT accept fax as we live in the modern world and we also do NOT accept carrier pigeon. **

Custom Cerakote Disclaimer:

Custom Cerakote is completed per order.  Our Cerakote room runs one color at a time so your ship date will be subject to the color rotaion at the time the order is placed.  You will receive an email confirmation once the item has actually been packaged to ship.

Cerakote items are not guaranteed to match separate batches or Cerakote completed by outside parties.  While we strive to keep our mix uniformed for our own products, we can't say for certain what Walter and Jesse cooked up in their lab out in Albuquerque.


  • 4

    Both of the trigger guard ears on the left side are noticeably taller and thicker. There were smaller grey streaks in the anodizing above the grip

  • 5
    Centurion Arms C4 Lower

    Purchased the C4 Lower for a project, great quality and quick shipping. The website made it easy and they notified me of shipping. Highly recommend.

  • 5
    CM4 Lower

    Tried them all... BCM, DD, AERO, PSA.... Centurion is absolutely the best quality lower available on the market today.

  • 5
    CM4 Receivers

    The CM4 is an excellent forged receiver. Consistently within spec, aesthetic roll mark, and a good price.

  • 5
    Based M16 cut

    Got referred to Centurion by a friend. I now have a 16 inch barrel and a new lower. Gonna buy only these from now on. Great company, excellent people excellent product.

  • 5

    There is a reason these are out of stock everywhere. Quality lower and great customer service.

  • 5

    Beautiful ano , extremely tight tolerances and tight fitment. Best company out there by miles.

  • 5
    Uppers - lowers

    If you know about Centurion and those that run/own it. You don’t really need to see reviews. Just go ahead buy what you want. Top notch stuff by good people. Simple.