AM-15 Complete Lower, M4 – Open

Rated 4.78 out of 5 based on 9 customer ratings
(9 customer reviews)


  • Standard Mil Spec Lower Receiver
  • Open Trigger
  • Standard M4 Grip
  • Anderson Lower Parts Kit
  • 6 position Buffer Tube Kit
  • This Complete Lower Receiver Comes With Parts Installed & Ready To Attach An Upper
  • FFL Required For Purchase

In stock

UPC: 784672106757 SKU: B2-K402-A000 Category: Tags: , ,


This Complete Lower Includes a Completely Assembled Lower, Lower Parts Kit and Buffer Tube & Buttstock Assembly.

The AM-15 Stripped Lower Receiver is American made with superior quality for less! Our lower Receivers are CNC machined from a high-strength, 7075 T6 aluminum forging for reliable performance and outstanding durability. Machined to Military Specifications & Standards and marked “Multi-Cal” to be used with multiple calibers on the AR-15 platform. This Lower Receiver comes in type III black hard anodize, and an Open Trigger. Don’t over pay for the same lower receiver with a different logo and use your money saved elsewhere on your build! Pair this with one of our Upper Receivers for a solid fit for your AM-15 build!

A Federal Firearms License (FFL) is required to purchase this item.

Click here to submit FFL or you can

Email your FFL to [email protected] 

This Lower Receiver comes installed with our Lower Parts Kit for AM-15 includes the following: Bolt Catch, Bolt Catch Plunger, Bolt Catch Roll Pin, Bolt Catch Spring, Buffer, Retainer, Buffer Retainer Spring, Disconnect, Disconnect Spring,  Traditional Hammer (Black in Color), Hammer Pin, Hammer Spring, Magazine Catch, Magazine Catch Button, Magazine Catch Spring, Pistol Grip (A2 style), Pistol Grip Lock Washer, Pistol Grip Screw, Pivot Pin, Pivot Pin Detent, Pivot Pin Detent Spring, Selector, Selector Detent, Selector Detent Spring, Takedown Pin, Takedown Pin Detent, Takedown Pin, Detent Spring, Traditional Trigger (Black in Color), Trigger Guard, Trigger Guard Roll Pin, Trigger Pin, Trigger Spring.

Comes Assembled with a Mil Spec Buffer Tube Kit. This includes: 6 Position Buffer Tube, End Plate & Castle Nut, and Carbine Length Buffer and Spring (Music Wire).

Additional information

Weight 2 lbs
Dimensions 15 × 7 × 1 in

9 reviews for AM-15 Complete Lower, M4 – Open

  1. Rated 5 out of 5


    Bought one of these locally, for my first build, and love it. quality is awesome, finish is great functions great. Why would you pay more??

  2. Rated 4 out of 5


    Bought one at the Louisville gun show. Pined it to my home built 300 Black out upper. Works great, all I added was a bad lever. Used it to harvest my deer this year.

  3. Rated 5 out of 5


    Bought one of these marked 300 blackout for my first build, and love it. quality is awesome, finish is great functions great. Why would you pay more?? very hard to find one marked 300 blk now for twice the price I paid!!

  4. Rated 5 out of 5


    Couldn’t ask for a better complete lower for the price..I’m very pleased

  5. Rated 5 out of 5


    I order one of your lowers put the upper on went to the range it performed great I`m a happy man

    • Michael Johnson

      Awesome Thank you

  6. Rated 4 out of 5

    Daniel Pelletier

    I bought this complete lower and paired it with an anderson upper. It is very basic but works very well and is well made. Only issue I had was the trigger not reseting. The hammer where it attaches to the disconnect after firing had a small lip probably from casting that would not let the trigger reset. some light filing fixed the issue. Also after a few hundred rounds the trigger pin in the lower drifts ever so slightly. Very well made lower, just a couple things that came up that I noticed. I wouldn’t hesitate to buy another.

  7. Rated 5 out of 5


    Got an Anderson lower at the Tampa gun show to build a 300 blackout vs a 556/.223, built it to my specs, put together a Frankenstein of parts for an upper and the result?: Shoots like butter! 500 rounds not a miss feed yet, normal and suppressed. The only problem that I have had was a magazine issue not a lower issue. I am now using a Magpul Pmag D-60 drum with no problems.

  8. Rated 5 out of 5


    I’ve used dozens of these in various builds (complete lowers, and stripped) used with many configurations of uppers never had any issues. Well made and a great value.

  9. Rated 5 out of 5


    Has anyone use this lower with a 450 Bushmaster upper? Is there any concerns if is used for the combination? I hav several Anderson uppers and lowers and the 300 Blackout works great but am stepping up to a 450. Thanks

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