Cross Machine Tool UHP15-SSA Billet Ambidextrous Stripped AR-15 Lower Receiver

Manufactured by Cross Machine Tool
Manufactured by Cross Machine Tool
2 Reviews

Out of Stock

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Items that are regulated by the ATF have restrictions and requirements: 
•Your entire order will ship only to a Federal-Firearm License holder.
•Please contact your local FFL prior to placing your order to ensure they are still accepting transfers.
•A copy of your order/invoice as well as the current FFL license for your local dealer must be emailed to



The Cross Machine Tool UHP15-SSA Ambidextrous AR-15 Lower Receiver is machined from a single billet of high-quality 7075-T6 aluminum and then finished with a durable hardcoat anodized finish. Compatible with a wide range of Mil-Spec and aftermarket AR-15 components, you can build exactly what you want. Because it is machined from a billet of aluminum, CMT can customize the outer dimensions for a unique look, while keeping the internal dimensions extremely precise for a tight fit. The SSA (Smooth Side Ambi) features ambidextrous controls and is free from any branding. Also included is a nylon tipped tension screw that will prevent wobble between the upper and lower. The main benefit of this lower is the threaded pins that replace the standard roll pins, so you can quickly finish the receiver without any hassle. Get started on your next build today with Cross Machine Tool.

  • Machined from 7075-T6 Billet aluminum
  • Type III Class II hardcoat anodized finish
  • Mil-Spec Magazine compatible flared magwell
  • Upper tensioning screw
  • Threaded bolt catch assembly screw
  • Compatible with Mil-Spec parts
  • No roll pins necessary for assembly
  • Machined trigger guard
  • Reinforced buffer tube area
  • Slick side with minimal branding
  • Ambidextrous magazine release (installed)
  • Ambidextrous bolt catch (installed)

The UHP15SS AR-15 Stripped Lower Receiver also features a flared magwell for fast magazine changes and is compatible with all aftermarket mags and drum mags. The integral trigger guard has been enlarged for gloved use and the front of the magazine well is textured if you prefer to grip the magwell when you are running a carbine style rifle. CMT is all about producing quality and consistent products. That is why they have even payed attention to the receiver extension area by increasing the thickness and increasing the amount of threads. This helps to prevent bending or breaking of the receiver extension.

Cross Machine Tool Co., utilizing the latest machining technologies, offers high quality products that you’ll be excited to own. Cross Machine Tool is a veteran owned business that takes pride in manufacturing products you will own. CMT products exceed military standards, so you can build the best AR style rifle possible.
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BrandCross Machine Tool
Caliber MarkingMulti-Caliber
FinishHardcoat Anodized
Receiver Material7075-T6 Aluminum
Trigger Pin DiameterMIL-SPEC .154
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

2 reviews

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good ambi receiver


love this true ambi receiver (both bolt release and magazine release are ambidextrous). No fitment issues and took it to the range and everything function flawlessly. One of the best price a for a true ambi AR15 lower receiver



Fit and finish is excellent! One of the better priced true ambi AR15 lower receiver. Functioned flawlessly at the range with 5.56 NATO 55gr ammo and PMAG 30rd magazines. Nice to be able to activate bolt release from left or right side