Rem 870 20" Mag Ext Kit Park

The Remington 870 20" Mag Ext Kit Park is a factory-engineered magazine tube extension system designed to increase the combat capacity of the Remington 870 12 gauge shotgun by three rounds. This is the original equipment manufacturer solution for operators and shooters who require expanded ammunition availability without replacing the entire magazine system or sacrificing the proven reliability of the 870 platform.

The kit includes the extension tube and calibrated spring, engineered to maintain the feed reliability and cycle rate that make the 870 the standard-bearer for tactical shotgun duty. Parkerized finish provides corrosion resistance in field conditions and aboard vessels where salt spray and moisture are constant concerns. Made in the USA, this extension preserves the shotgun's ergonomic handling and balance while delivering the extra capacity mission-critical in high-round-count scenarios. Installation requires no gunsmithing and integrates seamlessly with existing 870 furniture and compatible accessories.

This upgrade serves law enforcement patrol units, military trainers, competitive shooters, and civilian home-defense users operating 870 platforms who need faster reload intervals during training or extended-duty operations. The 870 remains the most widely fielded shotgun in North American law enforcement, making OEM magazine extensions a practical upgrade for departments and individuals standardizing on Remington's proven action and proven aftermarket support ecosystem.