AR15 Stripped Flat Top A4 Upper Receiver - from Bad Attitude Dept LLC Visit badattitudedept.com to purchase
AR15 Stripped Flat Top A4 Upper Receiver - from Bad Attitude Dept LLC Visit badattitudedept.com to purchase

Stripped AR15 Upper Receiver - A4 Flat Top Thermal Fit - Black Anodize

$89.95
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Bad Attitude Forged M4 / A4 Upper Receiver

********THERMAL FIT********

  • CNC Machined from a 7075-T6 forging
  • Mil-Spec Type Type 3 Class 2 anodizing
  • Dry film lube on the interior
  • Lugs held to the high end of the spec to help with a snug lower fit
  • M4 Feedramps
  • These are thermal fit receivers.  You will need to heat the receiver in order to install your barrel
    • Heat the receiver in an oven set at 250*.  Install the barrel and let it cool to room temperature before you install the barrel nut
    • GENTLY heat the front of the receiver with a propane torch.  Do not overheat the receiver.  You need only to heat it slightly to install the barrel.  Install the barrel quickly and let cool to room temperature before you install the barrel nut.
  • Bad Attitude Department is not responsible and will not replace uppers damaged due to improper heating or installation.  If you run in to a problem, let us know and we can help you out. 
  • Fits all standard Mil-Spec dimension components
  • Custom engraving available

If added, T-Marks will be laser engraved in white

For custom logos, please check our our BCG page for examples or email us first with your logo idea.  Logos will only be placed on the top rear of the receiver, just above the charging handle.  Deep engraving destroys all anodizing and usually requires a coating or color fill to protect the exposed aluminum.

Product Reviews

Score: 5 out of 5 (based on 3 ratings)
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5/5
Stripped upper.
Written by Joseph Prarr on 17th Sep 2025

Purchased this upper for UAR-15 clone. BAD worked with me to get the correct engraving done after I messed up the order. Greet customer service!

5/5
Love it
Written by Jacob on 18th Feb 2025

I just did my first upper receiver build, using this receiver. Stern Defense 9mm barrel and BCM handguard. Everything fit perfect. The upper has zero wiggle mated to a Type-A lower receiver. Will buy again.

5/5
Excellent Upper
Written by Jim M on 8th Jul 2022

If you want an upper from a reputable source, you can’t go wrong here. There is some minor pitting in a couple of places that you have to get REALLY close to see, but the finish is perfect and tolerances are TIGHT! Very happy for my milspec build.

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