Lantac UAR Billet Upper Advanced Receiver

Manufactured by Lantac USA
Manufactured by Lantac USA
2 Reviews

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The Upper Advanced Receiver is precision machined with an ultra-smooth proprietary bore. At a roughness average of 16 µin, bolt carrier friction is significantly less than a typical upper receiver creating a silkier action. Featuring the SMOOTHCAM system, a domed head, low friction cam pin and blended cam recess have been carefully designed to further reduce friction and wear against internal surfaces. Barrel nut threads, bore, and barrel extension surfaces are all machined in one operation for a perfectly concentric, perpendicular fit to the barrel assembly.

  • Billet 7075-T6 aluminum receiver
  • MIL-SPEC Type III Class 2 hardcoat anodized finish
  • Ultra-smooth burnished bore
  • M4 feedramps
  • Blended SMOOTHCAM System
  • CP-R360 Domed Cam Pin included
  • Weight 8.8 oz
  • Made in the U.S.A.

The included Domed Cam Pin is machined from 17-4 PH stainless steel, hardened to H900, polished, and finished in its natural hardened coppery state. The circular head has a flat face machined so that it may be inserted into any bolt carrier without removing the gas key. Two further flats are machined at 90 degrees to the front face, minimizing internal wear to the cam channel.

LANTAC USA manufactures the highest quality accessories for AR-15/M16 pattern rifles. Precision made in the U.S.A., rifles, muzzle brakes and more.
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BrandLantac USA
Feed RampsM4
FinishHardcoat Anodized
Forward AssistAccepts Standard Forward Assist
Port DoorAccepts Standard Port Cover
Receiver Material7075-T6 Aluminum
T MarksUnmarked
Weight8.8 Oz

WARNING: This Product can expose you to chemicals which is known to state of california to cause Cancer and Reproductive Harm. For more information, see

Ratings & Reviews

2 reviews

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lantec uar is a must have if u got the money

by -

just receive my lantec uar the other day and im very please with primary arms service and lantec usa quality billet.

Best Billet Upper you can buy period!


Fantastic Upper Receiver. Anodizing is super thick, no machine marks anywhere, the surface of the internal bore of this receiver is actually smoother then the face of a geissele trigger. Domed cam pin takes out fiction and aids in smoothness of cycling the action, I had no need to lap any of the UAR uppers I have built as all were perfectly true, forward assist is slight moved to allow easier access to charging handle (good for lefties), these have a PAD* right under the front take down lug to take up any slop from non matching lowers, in some cases you need to take a piece of sand paper or something similar and sand it down a little if having trouble with the rear takedown pin to fit, which it is intentionally built this way, used these on a couple spikes a couple andersons dpms, POF, PSA and a noveske chainsaw lowers and all have fit beautifully. The strike industries UDC polymer dust covers do not fit this upper, all other dust covers I have tried have fit so far.