Ground Zero Precision is proud to announce their exclusive distribution agreement with Stiller’s Precision to bring the sniper inspired Predator XT billet AR-15 Lower Receiver to market.
Give your next precision AR-15 project a state of the art foundation with the Predator XT Billet AR lower by Stiller’s Precision. Jerry Stiller, world renowned designer and manufacturer of the U.S. Navy’s legendary MK13 300WM sniper rifle action, researched far and wide to determine what exactly the perfect precision AR lower receiver should be and the Predator XT is the result. He very quickly determined that the only way he could offer all of the features he wanted while completely eliminating torsional stress would be to start with a billet blank. After a painstaking and extensive material study it was determined that the best combination of stiffness, strength and toughness necessary for the foundation of a hyper-accurate AR rifle was offered by a relatively unknown high performance aircraft alloy that is used predominately in the construction of the F-16 and other U.S. military fighter jet structures. The alloy, 7050-T7651, is almost twice as strong as 6061-T6 and has better crack resistance than 7075-T6 while offering a higher level of corrosion resistance and lighter relative weight than both. As with everything else Jerry has produced this alloy was the absolute best material for the job, so that is what he used.
As for the design, it all started with the standard forged Mil-Spec lower receiver drawing and quickly morphed into something completely different as features were added and deemed necessary. In order to add the torsional stiffness necessary in a precision rifle foundation, the magwell area was ribbed in a truss pattern along with an expanded width trigger guard. The magwell was designed and chamfered to allow for a wider flare for easy magazine insertion and sized to allow all currently marketed magazines to drop free without snagging or catching in the magwell. Rather then machine or broach the magwell, wire EDM technology was used to more exactly control the size and exact position for flawless feeding. A textured finger grip area was added to the front to help control the weapon when holding with the offhand on the magwell. To help keep a wide range of upper receivers tight, all of the pin locations and mating surfaces are under constant and close control during the machining process and a nylon tipped tension adjustment screw was added under the rear pin location to allow the shooter a wider range of upper receiver choices and the ability to keep the lower and upper fit tight with one simple adjustment. All of the edges and inner corners have been chamfered or rounded for ergonomics and additional strength. The stock boss (buffer tube area) on the back was also beefed up to add strength and a small setscrew was added for the rear pin spring to help keep stock installation or replacement a snap. After all that, a Mil-Spec type III 2 mil thick hard anodize is performed by one of the defense industries’ top suppliers for excellent surface wear, additional corrosion resistance and ravishing good looks.
– Precision machined from 7050-T7651 aluminum super alloy for the absolute highest stiffness, strength and toughness
– X-Rib magwell stiffeners and extended width machined in trigger guard add overall strength and stiffness.
– Flared magwell that is wire EDM cut for exact size and alignment for easy drop free use of all currently marketed magazines.
– Machined finger grip pad on front of the lower allows for easy control of weapon during use
– Extra beefy stock boss adds strength, stiffness and greatly reduces the chance of breakage when used with even the most powerful cartridges.
– A setscrew is added to help retain rear pin spring and ease the installation or replacement of stocks.
– Nylon tipped tension adjustment screw allows the shooter to adjust the lower to upper receiver fit.
– Type III hard anodized to 2 mil deep for excellent wear and looks
– Marked for multi-caliber use and specified as other to ATF so that it can be used for pistol or rifle
About Stiller’s Precision:
Stiller’s Precision Firearms was founded in 1998 by Jerry Stiller, a defense engineer working for Raytheon. His goal was to supply shooters with a best quality product for a reasonable price. Curtis Helton, a Raytheon machinist soon joined the company and we became successful benchrest suppliers and mediocre shooters. In 2005 we added our hunting line of actions, the Predator series. Soon after the TAC series for the tactical market followed. We still follow our original goal and feel it has served us well. Currently we build actions for all different parts of the industry including the MK13 for the US Military. Many of the custom rifle builder’s receivers you see are made right here by us.
Stiller’s Precision Firearms is able to keep the quality up and costs down by a unique blend of processes used to manufacture our receivers. We have over 20 late model CNC machines dedicated to building receivers and their parts. We buy the best to build the best. Most of our machines are dedicated to one operation. By doing this, the quality and consistency goes up and labor cost goes down by never having to tear down setups. As soon as anything looks or sounds different it is quickly apparent to the machinist and the problem is solved. Our volume allows this to happen and work for you, our customers, we deliver the best quality and value possible.
We use the best materials, tooling and processes to ensure our actions are second to none in quality or value. All of the steel used in action bodies is 416R barrel quality stainless and the one piece bolts are made from VAR aircraft certified 4140 alloy steel. Small parts are built out of materials best suited for their purpose and includes many tool steels and exotic high strength aluminum alloys.