Sunday GunDay: F-Open Rifle with McMillan Kestros ZR Stock

The Southwest Nationals (SWN) is right around the corner. Hosted by the Desert Sharpshooters Rifle Club at the Ben Avery Shooting Facility outside Phoenix, the 2024 SWN takes place February 14-18, 2024. One of the major F-Class matches of the year, the SWN will feature top F-Open and F-TR rifles. And many of those F-Open rigs will be running McMillan stocks. Today’s Sunday GunDay story is about the most sophisticated F-Open stock in McMillan’s line-up, the Kestros ZR.

Kestros ZR Stock — Impressive Design for Competition

Review by F-Class John
Walk the line at just about any rifle competition and you’ll see your share of McMillan stocks. Known for crafting high-quality fiberglass/composite stocks, McMillan has long been at top choice for competitive shooters, hunters, and tactical marksmen. McMillan’s latest top-of-the-line F-Open stock is the impressive Kestros ZR which features an extended front bag-riding Z-Rail. McMillan notes that the ZR’s “extended rail system, which extends the fore-end of the stock, provides all the benefits of the rails on the Kestros R stock while also lowering the center of gravity.” In addition, “the bottom of the buttstock is perfectly parallel to the rail with a 5/8″ flat for improved performance in a rear sandbag.”

The Kestros line features several models, but the ZR represents the pinnacle of craftmanship. Each one is finished off by a single craftsman and takes roughly four times longer to create than any other Kestros. So when McMillan offered me a chance to test one out, I jumped at the opportunity.

The aluminum Z-Rail extends nicely from the front of the stock and has a nice contrast of metal against the matte finish of the stock. I inspected the rails and noticed that they are very cleanly machined — all the corners and rails were precise and sharp. As a result, I grabbed some 1000-grit sandpaper and just lightly knocked the edges and corners down just to keep from accidentally scratching myself or my gear.

When I was ordering the ZR, lead time was about 6-9 months. I was like a kid on Christmas when mine arrived after seven months. Holding a Kestros ZR is definitely a unique experience compared to a traditional wood stock and you can’t help but feel like you’re holding something special. I chose three shades of blue that transitioned dark from the butt stock to lighter on the fore-end in a spectacular flame pattern. With McMillan, there are thousands of possible color and pattern combinations. These color/pattern options are outlined on McMillan’s Gallery Page.

The Kestros ZR comes fully inletted with pillars. I was able to bolt my Defiance action right into the stock “as is” without a bedding job. (McMillan states bedding is not required, though this is certainly something most Kestros owners will do). I threw in my action, fit a couple action screws and tightened it all down. I was amazed at how nicely it all fit together with even the little details like the port cutout being perfectly smooth with my action port. I loaded up some .284 Win rounds and headed to the range to test the new stock at 100 yards.

Here are examples of targets shot with the Kestros ZR at 100 yards.

During initial range testing (see above) I shot nine groups for vertical and all of them were under 0.40″ with the smallest being .08″ of vertical. I topped off the testing by shooting a 200-11X the next week at my club match. The thing that really stood out was how smoothly the stock tracked with its lower center of gravity while shooting free recoil and ultimately this translated to success on target.

Low-Rider — You may find that because of how low the Kestros rides as well as its additional length due to the Z rail, you may require an extension for your front rest.

CONCLUSION — Great Modern Low-Profile F-Class Stock
Overall the Kestros ZR exceeded my expectations. After a small learning curve, it was a joy to shoot and it performed great. As someone who believes in the power of muscle memory, I found each time I transitioned between the Kestros and my traditional wood stocks there was a slight adjustment period but not enough to impair accuracy in any way. Something to consider is that because every Kestros is made to the same dimensions, it makes owning multiples an easy process of switching between guns without any need for readjustment.

For those willing to put in the practice, your patience will be rewarded, and I think most shooters will find the Kestros ZR could become their new favorite stock. If you’re in the market for a new F-Open stock, the Kestros ZR is definitely one to consider.

McMillan Kestros — Proven National Championship-Winning Stock

Norm Harrold (above) won the 2018 USA F-Open National Championship shooting a .284 Shehane. Norm’s F-Open rig features a McMillan Kestros ZR stock and Bartlein barrel chambered for the .284 Shehane, which has a bit more case capacity than a standard .284 Winchester. Norm loaded Berger 184gr 7mm bullets in Lapua brass. Norm revealed his load in an Erik Cortina YouTube Video.

Tips for Ordering a Kestros ZR
You can order a Kestros ZR and other Kestros stock models via McMillan’s Competition Stocks Page. While there are a number of options available, McMillan has a helpful guide that walks you through each one to ensure you get exactly what you need. F-Class John notes: “While filling out my form I realized that because I have a custom-designed action, I needed some help, so I gave McMillan a call. The staffers were incredibly helpful and their knowledge of all the major actions out there made answering my questions a snap. I liked the fact that there is no set, fixed price on any of the stocks. The pricing system allows customers to get just what they want (within limits) and not have to pay for anything they do not want or need.”