First announced in December 2019, the Z1 and Z10 stock from McMillan usher in a new era in the field of rifle customization. Told apart by features, essentially identical in goal, the Z1 and Z10 mark the debut of McMillan's new Universal Stock line.

Using a large collection of Remington brand and clone actions, the McMillan company was able to compile measurement data and then calculate a precise inlet measurement that could accommodate each of them while maintaining their accuracy.

While earlier stocks feature an inlet specific to their mated action, any action that shares the action diameter and guard screw spacing of Remington types will fit the Z1 and Z10 off the shelf.

The universal drop-in inlet for Remington 700 original and clone actions – including custom versions such as Defiance, Bighorn, Stiller, Kelbly, and others – will thus allow the new Z1 and Z10 stocks to accommodate a wide variety of Remington-type action. The stock also features a low top line to eliminate the need for bolt release inlets and port cuts.

In addition to a set of aluminum pillars, the new McMillan Z1 and Z10 stocks also feature a universal barrel channel that will readily accept the vast majority of barrel contours; other ergonomic features of the new Universal Stock line include a finger stop on the grip, allowing the trigger finger to rest at the exact level of the trigger just behind the guard for quicker and smoother response times; and a thumb shelf just behind the bolt port on the right and left sides, allowing users to grip the stock seamlessly during firing and at rest so that the new stocks truly feel like an extension of one’s arm.