Home AR-15 Aero Precision AR15 Lower Receivers – M4E1 vs X15/Gen2

Aero Precision AR15 Lower Receivers – M4E1 vs X15/Gen2

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Kirk from Aero Precision explains the differences between Aero Precision’s traditional mil-spec X15/Gen 2 Lower Receiver and the upgraded M4E1 Lower Receiver.

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36 COMMENTS

  1. You guys make an awesome product… the only problem for me on all of my aero precision builds is the fact that there is too much slop between upper and lower receiver.. i know the nylon tipped screw is there to help but it pushes up on the upper and creates unnecessary gap and also does not do anything for the front portion of the receiver… might I suggest oversizing the locking lugs 1 thousandth over to help with that… if you have a better suggestion please help… would like to just buy a lower from you that works and not have to buy oversized take down pins from other manufacturers

  2. The 308 lower has 2 springs that are captured by the handle, but there is only one hole to aid in this process. Adding a second hole to a standard handel would eliminate the issue, I would rather have a hole and not need it on the 15 than need the hole on the 308 and not have it.

    This end plate 440 capture plug and spring is a nighmare. How for the love of live are we the builders supposed to get that spring compressed to the point where you can thread the plug in the hole. I am a fan of your lowers both the 15 and 308, however your name is Precision but your part kits are just standard kits. Small efforts can yeild the largest rewards, cut the spring and drill a hole.

  3. I love my M4e1 and I just bought another but this time I bought the x15 though background check got delay. Fcking covid.
    I just love aero lower my friend and families has Anderson and palmetto and you can tell Aero built like a tank.

  4. People really love these, wish I found some M4e1 lowers in stock. I settled for a Gen 2 of the older one, but it still should be solid when I get it. Hope this race settles down enough to get the newer one at some point.

  5. Perhaps Aero Precision can confirm, but appears there is another difference:
    the X15/Gen 2 comes in five color choices – Black, FDE (tan), Burnt Bronze, Olive Drab, or Tungsten
    the M4E1 appears to only come in two color choices – black or FDE

  6. This is all great but doesn’t help me if Primary Arms who is local to me can’t keep these in stock. Needing a M4E1 stripped lower to complete a build but having hell getting it. Almost tempted to buy a Anderson since that’s all they have left.

  7. I love your products, but you need to tighten up your inventory labels. Someone put M4E1 Enhanced Upper Receiver UPC labels on stripped threaded upper receiver boxes. I was told I'm not the only person this happened to. Luckily I found one elsewhere because M4E1 Enhanced Uppers are pretty much sold out everywhere. With these extended shipping times, and the hassle of having to return an incorrect item, those boxes need to be labeled precisely.

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