The MTM Case-Gard Ammo Box Foam Liner (FL-1-42) is an open-cell foam insert designed to secure cartridges and protect bullet tips inside rigid polymer ammunition cases. Measuring 1/2 inch (approximately 12.7 mm) in thickness, this dark charcoal grey foam sheet fits directly into the lid of ammunition boxes up to the 100-round rifle size (R-100 series). It eliminates internal cartridge play, deadens audible rattling during vehicle transit or stalking, and cushions soft-point and ballistic tips against deformation if cases are inverted or transported across rough terrain.

Key Features

• Projectile Tip Cushioning: Provides a 1/2 inch barrier of open-cell foam between the bullet tip and the hard plastic lid, preventing soft-point flattening and meplat damage.
• Rattle Elimination: Dampens internal movement to stop ammunition from clicking and rattling inside the case grid while on the move.
• Cartridge Retention: Keeps individual rounds seated inside their allocated tray slots if the ammo container is tipped sideways or upside down.
• Trimmable Design: Sized to cover a full 100-round rifle case, the foam can be cut with scissors to line two standard 50-round ammunition boxes or one Deluxe H-50 series box.

Specifications

• Material: Open-cell foam
• Thickness: 1/2 inch (approx. 12.7 mm)
• Colour: Dark Charcoal Grey
• Maximum Box Compatibility: MTM R-100 series (100-round rifle capacity)
• Adaptable Box Compatibility: Up to two standard 50-round boxes or one Deluxe H-50 box (when trimmed)
• Manufacturer Part Number (MPN): FL-1-42

Who is the Mtm Ammo Box Foam Liners Stops Rattle Fits Up To R-100 for?

• Field hunters using MTM ammunition cases — Requires silent stalking conditions, which this ammo box foam liner achieves by using 1/2 inch (12.7 mm) thick open-cell foam to compress against loaded rounds and eliminate all audible cartridge rattle in transit.
• Benchrest target shooters — Relies on consistent projectile aerodynamics, protected by this ammo box foam liner whose 1/2 inch (12.7 mm) padding prevents bullet tips from flattening or deforming against the hard plastic lid during transport.
• Practical precision reloaders — Needs adaptable component protection across varied case sizes, utilising this ammo box foam liner's 1/2 inch (12.7 mm) profile that can be used whole for large 100-round cases or trimmed down to protect two separate 50-round ammunition batches.

Less suitable for: Handloaders whose custom or oversized cartridges already sit completely flush against the closed box lid with zero clearance; adding a 1/2 inch foam insert will prevent the lid from latching, making a taller, deeper ammo case model the better choice.