MDT M-LOK Multi-Caliber Spare Round Holder

• Two rounds kept on the rifle: Carries 2 spare cartridges directly on the side of the rifle, keeping immediate reloads close at hand for competition stages, hunting follow-up shots, or backup rounds when a magazine issue slows things down.
• Multi-caliber fit system: The included small and large caliber polymer bodies with an adjustable spacer system let the holder adapt to a broad range of cartridges, so one accessory can serve different rifle setups instead of being tied to a single chambering.
• Reversible M-LOK mounting: Its left- or right-side mounting layout helps shooters place spare rounds where they are fastest to reach, while M-LOK compatibility makes it easy to integrate with modern chassis and forends.
• Staggered clearance design: The offset cartridge position leaves more room around the ejection port, helping the holder stay accessible without getting in the way of normal rifle operation.
• Durable polymer construction: The glass-filled polypropylene body keeps weight low while standing up to regular field and range use, making it a practical add-on for precision rifle builds.

About the MDT Accessories Series

MDT Accessories sits alongside the company’s chassis and magazine lines as the supporting hardware for building out a precision rifle system around real shooting needs. Rather than focusing on one type of component, the series covers a broad mix of practical add-ons, including M-LOK accessories, weights, magazine-related parts, buttstock components, bolt knobs, hoods, and other rifle enhancements. That breadth makes the range relevant to both target shooting and hunting, where rifle balance, fit, ammunition handling, and accessory placement all affect how efficiently the rifle works in the field.

A defining trait of the series is its emphasis on modularity. Compatibility varies by accessory, with some parts designed around specific MDT chassis or buttstocks, while others are intended to fit more broadly across modern rifle platforms. Across the range, the design philosophy is practical rather than decorative: accessories are meant to improve rifle setup, adjust weight distribution, or make critical items easier to access under pressure. Within that context, the MDT Accessories family is best understood as the finishing layer of a precision-rifle build, giving shooters a way to tailor handling and support equipment to the job at hand.

About the MDT M-LOK Multi-Caliber Spare Round Holder

The MDT M-LOK Multi-Caliber Spare Round Holder is a compact rifle accessory built to keep a small reserve of ammunition attached directly to the gun, where it remains faster to access than loose rounds in a pocket or pack. Its main advantage is simple but useful: it stores 2 additional rounds on the side of the rifle, giving the shooter immediate access to a follow-up shot, a stage-saving reload, or a contingency round if a magazine is dropped or a feeding problem interrupts the sequence. For precision rifle competition and practical hunting use alike, that kind of access can save time and reduce unnecessary movement.

What makes this model especially versatile is its multi-caliber design. MDT supplies both a small and large caliber polymer body, together with an adjustable spacer system that uses washers and O-rings to tune cartridge retention. In practice, that means the holder can be set up for a wide spread of cartridges rather than serving only one chambering. The reversible layout also matters in real use: it can be mounted on either side of the chassis, allowing right- or left-handed shooters to place rounds where they are easiest to reach.

The holder is also shaped with rifle function in mind. Its staggered design increases clearance around the ejection port, helping it stay out of the way while still keeping ammunition close. It mounts via M-LOK and can also attach to the accessory holes on the side of an ACC chassis, making it a natural fit for modern precision rifle setups. The glass-filled polypropylene construction keeps the unit light, durable, and suitable for regular range and field use.

About MDT

MDT Sporting Goods was established in 2009 and began in Chilliwack, British Columbia, Canada. The company’s head office remains in British Columbia, and MDT focuses on designing, manufacturing, and selling rifle chassis systems, magazines, buttstocks, and accessories for target shooting and hunting. Its product range extends across chassis, stocks, bipods, scope bases, scope rings, and other precision-rifle components, reflecting a specialization in modular rifle equipment rather than general outdoor gear.

A useful point of context for this product category is that MDT identifies the TAC21 as its first chassis, and the company states that its chassis, magazines, and accessories are developed with input from competitive precision shooters. That background shows in accessories such as this spare round holder, which are designed around rifle handling, modular mounting standards, and practical use on modern precision rifle platforms.

Main Features

• Manufacturer: MDT
• Series: MDT Accessories
• Accessories for: Rifles
• Color: Black
• Made in: Canada
• Warranty: 2 years

Warranty

MDT provides a 2-year warranty for this product. That stated warranty period supports the spare round holder as a practical rifle accessory intended for regular use on the range and in the field.