Iver Johnson Choke Tube .410 - Modified Mobil Choke

The Iver Johnson Choke Tube .410 - Modified Mobil Choke is a precision-engineered shotgun accessory designed for shooters who demand reliable pattern control and shot consistency. Built for the .410 bore platform, this choke tube delivers a modified constriction ideal for hunting small game, sport shooting, and tactical training scenarios where shot placement accuracy matters. The Mobil choke threading system ensures tool-free field installation and removal, making it an essential upgrade for operators and civilians who prioritize versatility in their shotgun setup.

Modified choke constriction tightens the shot pattern beyond improved cylinder but remains more open than full choke, balancing pellet density and velocity retention at medium distances. The Mobil choke design uses standardized threads that integrate seamlessly with compatible Iver Johnson .410 shotguns and other firearms featuring Mobil-threaded choke systems, allowing rapid swaps between modified, full, and specialized patterns without gunsmithing. The compact 3-inch length and 0.03 lb weight add negligible muzzle weight, preserving the natural handling and balance of lightweight .410 platforms while delivering measurable improvements in shot grouping on target.

Law enforcement trainers, rural hunters, and competitive shooters benefit most from the flexibility this choke tube provides, especially when working within the ballistic constraints of the .410's smaller payload and lower velocity. Installation requires only hand-tightening into the barrel's muzzle end—no specialized tools or armorer expertise needed. Before installation, verify your shotgun's choke system uses Mobil-style threading; consult your firearm's manual or contact the manufacturer if uncertain. This choke tube pairs effectively with standard .410 ammunition and delivers optimal patterns at 25–40 yard distances typical of .410 hunting and sport applications.