This particular Accuracy International AX is chambered in .308 Win. with a 20" 5/8"x24 Thread Pitch barrel with the protector. It features a Black folding and fully adjustable stock.

The AX Short Action and AXMC (AX Multi Calibre) advanced technology weapon system provides military, law enforcement and civilian shooters the latest in Accuracy International battle-proven features: accuracy, reliability, ruggedness and unrelenting quality. The AX is a user-configurable, mission adaptable, long-range sniper system.

As of April 15th, 2016, Accuracy International has announced that a left-handed version of the AXMC and AX Short Action rifle will be produced.

The Accuracy International AX rifle is the flagship multi-caliber rifle in the AI line. As such, you can expect superiority in features, including:

Full-length NATO STANAG 4694/Mil Std 1913 rail for accessories, optics, night vision equipment, and more. Aerospace-grade aluminum with a corrosion-resistant protective coating. Rail is inclined 20MOA for .308 Win and 30MOA for magnum calibers.
While the top foreend rail is full-length (and matched to the angle of the action rail), the foreend of the AX is an octagonal tube featuring AI's patented KeySlot mounting system. This foreend is easily removed with the 4mm hex wrench stored in the cheekpiece.
QD flush cup sling attachments are located on the main chassis and removable/repositionable attachment points are located on rail sections attached to foreend.
QuickLoc barrel release system allows for barrel removal and refit in under one minute using only the 4mm hex wrench included in the cheekpiece.
Chassis folding stock reduces overall rifle length by 260mm (~10").
Cheekpiece is configurable for lateral and height adjustments and also stores a 4mm hex wrench for rifle disassembly.
Butt pad features a friction-locking mechanism for easy, tool-less height and angle adjustment. Rifle length of pull can be adjusted by 40mm without tools or accessories, and even more with the addition of optional 10mm or 20mm spacers (not included)
The pistol grip is replaceable in minutes and can utilize different backstraps.
3-position safety is based on the design of the Accuracy International Arctic Warfare (AW) battle-proven system.
Two-stage trigger with adjustable shoe
Includes 10-round low-friction magazine