This listing is a SIG Sauer MCX CAL-X conversion kit in 5.56 NATO with a 16-inch barrel. While more than one barrel length is offered, this listing is for this 5.56 NATO 16-inch kit only. It is a conversion kit, not a complete rifle.

The kit is built for the MCX SPEAR LT. It includes a 16-inch 5.56 NATO barrel and gas-block assembly. Published twist for this 5.56 16-inch barrel family is 1:7.

This listing is the SIG Sauer MCX CAL-X 5.56 NATO 16-inch conversion kit only.

• Manufacturer: SIG Sauer — MCX CAL-X kit 5.56 NATO 16 in, SKU WCALX-MCX-556N-16B-LT, UPC 798681682294
• Cartridge: 5.56 NATO
• Barrel: 16 in; gas-block assembly included
• What this is: conversion kit, not a complete rifle
• This listing: this 5.56 NATO 16 in CAL-X kit only
• This item is restricted to LE / MIL / first responders only.