LOTHAR WALTHER barrel insert in .22LR For shooting less powerful, inexpensive cartridges in guns chambered for high-performance cartridges. The less powerful cartridge is very useful for inexpensive practive, blinking and for taking small game which would be ruined when the high-velocity cartridge is used Available in: 270Win, 308Win, 30-06, 7mm Rem.Mag, 300 Win.Mag,Special Order $149.00