BCM Complete Gunfighter M4 Lower Receiver Assembly *Cosmetic Blem*


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(28 customer reviews)

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BCM Complete Gunfighter M4 Lower Receiver Assembly

BCM® Professional Grade Weaponry® are hard use tools, built to perform in combat where unfailing performance is the only standard for men and machine.

Exacting construction and rigorous durability are the standard for every weapon system that comes off our line. These are machined from 7075-T6 forgings to milspec dimensions and built meticulously with great attention to detail.


  • BCM PNT Trigger
  • H buffer and carbine buffer system
  • Six-position receiver extension
  • BCM Gunfighter Mod 0 trigger guard
  • BCM Mod 3 pistol grip
  • BCM Gunfighter Mod 0 stock
  • Black anodize finish
  • Properly staked

28 reviews for BCM Complete Gunfighter M4 Lower Receiver Assembly *Cosmetic Blem*

  1. jbpd (verified owner)


    First, the ordering process: They’re about to ban AR-15s and other semi-automatic rifles here in Washington, so I ordered this sooner than I intended, on March 13th. I’m 2 time zones away from Rooftop Defense. I received a tracking email about an hour later saying my order had shipped. I received another email on the 15th letting me know my BCM lower had already been delivered to my FFL. I got a call this morning (16th) from the FFL letting me know I could come do my transfer paperwork, pay my fees, then take it home.

    I’m still in disbelief this firearm left Arkansas and arrived in WA and is in my possession 3 days later. I’ve ordered several firearms online before and I have NEVER gotten one that fast. I ordered an Aero Precision lower and it took a day or 2 longer to get it from Tacoma, just a few miles south of Seattle, to my FFL. With this order, I even got dinner, a Rooftop Defense sticker, and a copy of the Constitution with my order!

    Now, the rifle. I have heard many people say how great BCMs were. I wondered what separated BCM from any other AR-15. I own a budget build AR with an Anderson MFG lower and everything else from Ground Zero Precision. I bought it during the Obama administration and it took a few tweaks before we finally got it right. A few months ago, I bought an Aero Precision complete lower and a complete upper, just had to add a BCG and charging handle (nickel boron for both, of course). I still have not yet fired the Aero Precision AR yet, but it is stiff compared to the Anderson/GZP build, especially the dust cover and the selector switch. I have trained with a Colt LE model, and the FN-15. I can’t tell a great deal of difference between the different rifles, except that the Colt is a little easier to break down for cleaning than the FN.

    I haven’t shot the BCM yet, but it literally feels different than any mil-spec AR-15 I’ve ever held in my hands. The selector switch is as smooth-shifting as could be. It has a nice trigger. Now I just need to find the right upper for it!

    I saved $50 by buying the “blemish” version, and I had to search for the blemish before I finally found it. I recommend saving yourself a few bucks and buy the BLEM version too. Unless your a world-class anal-retentive freak, you’ll never notice it.

    I can’t say enough great things about Sol & Rooftop Defense. Prices are great, you get super fast delivery, and Sol responds to your emails quickly if you have a question. Based on my experience, I would ABSOLUTELY recommend buying from Rooftop Defense.

  2. Rusty Shackleford

    These are great lowers, especially for the price. I purchased a couple of these long before rooftop was even in business, and they have had zero issues. It is a great price to combine with an upper of your choice to make an awesome rifle.

  3. H.P. Dees

    Roof Top Defense & Sol the owner, were absolutely great to deal with. Fast service. Emails & phone calls immediately, fast & professional like a true professional should. The item was excellent! Flawless & the item was ready to be shipped within an hour of purchase . Was delivered within 2 days & the owner was immediately sending emails & follow ups to see if service & delivery was all great. Can’t ask for better service then Roof Top Defense! Other stores could learn from this great service. Ty to ROOF TOP DEFENSE. 100% excellent.

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