Lyman Series 20 MJT-LJT Insert Set

The Lyman Series 20 MJT-LJT Insert Set is a precision-engineered accessory designed for competitive rifle shooters using Lyman's 20 MJT-LJT aperture sight systems. This matched insert kit provides the interchangeable front and rear aperture components necessary to fine-tune sight picture for different lighting conditions, range distances, and competition formats—particularly for Anschutz-pattern rifle platforms where precision aiming is non-negotiable.

The set includes two post inserts ranging from .067 to .102 inches wide, plus five aperture inserts spanning .126, .133, .154, .161, .169, and .177 inches. This range of aperture diameters allows shooters to optimize the sight picture for match conditions—smaller apertures improve sight alignment in bright daylight by reducing peripheral light distortion, while larger apertures admit more light in overcast or indoor range environments. The precision tolerances in these inserts ensure repeatable performance and minimal impact on elevation zero when changing between sizes during competition transitions.

Competitive smallbore and target rifle shooters—whether competing in three-position match formats, benchrest events, or club-level precision disciplines—rely on interchangeable aperture systems to maintain consistency across varying environmental conditions without adjusting mechanical elevation or windage. The Lyman MJT-LJT series is known among rimfire competitors for direct compatibility with Anschutz-equipped rifles, a standard platform in organized competitive shooting. Quick insert swaps between stages or stages keep competitors focused on technique rather than equipment adjustments.

At 0.02 lbs, this lightweight kit integrates seamlessly into a shooter's field kit without adding appreciable weight or bulk. Lyman's long history in precision sight manufacturing positions these inserts as reliable components for shooters who understand that sight picture quality directly impacts competitive scores. Whether upgrading an existing system or building a complete spare set, the Lyman Series 20 insert assortment provides the optical flexibility that serious competitors require.