Iver Johnson Choke Tube 12ga. - Modified Mobil Choke

The Iver Johnson Choke Tube 12ga. Modified Mobil Choke is a precision-engineered shotgun choke designed for shooters who demand reliability and pattern control from their 12-gauge firearms. Built to tight OEM specifications, this choke tube threads into the muzzle end of compatible shotguns using the proven Mobil choke system, allowing rapid field adjustments without tools. Law enforcement and military operators rely on choke tubes to adapt shot patterns for everything from tactical breaching to sport shooting, making this component essential for any serious 12-gauge platform.

The Modified constriction sits in the middle of the choke spectrum, delivering a balanced shot pattern that performs effectively at medium ranges while maintaining sufficient spread for close-quarters work. This geometry concentrates pellets tighter than an Improved Cylinder but opens faster than a Full choke, making it the tactically versatile choice for home defense or duty use where range conditions vary unpredictably. The Mobil choke-style threading ensures secure seating and positive retention; the compact 2.95-inch profile keeps overall gun length minimal, critical for operators working in confined spaces or vehicles. Manufactured to Iver Johnson's exacting standards, this tube exhibits superior corrosion resistance and dimensional accuracy essential for consistent cycling and reliability.

This choke tube is ideal for combat shotgun users, defensive shooters, and competition participants running Iver Johnson 12-gauge shotguns or any firearm with standard Mobil choke-threaded barrels. Simply unscrew the existing choke tube by hand or with a standard choke wrench, align the marking on the new tube with the witness mark on the barrel, and hand-tighten until seated—no gunsmithing required. The Modified constriction excels in realistic engagement distances from 15 to 40 yards, matching the ballistic performance expected in tactical and defensive scenarios. Verify barrel compatibility with Mobil choke threading before purchase to ensure proper fit and function.