HK Army HSTL Thermal Lens - Ice HK HSTL The ASA is then locked

The ASA is then locked to the rail with it's mounting set screws allowing even further adjustment

air spring

Field One Force - Jumper Board

4x 012 NBR 70 O-Ring

HK Army HSTL Thermal Lens - Ice HK HSTL The ASA is then lockedHK Army HSTL Thermal Lens The HSTL Goggle Lens System is composed of virgin optical grade GE polycarbonate inherently UVA \ UVB and IR shielded, every HSTL lens shields your eyes from dangerous sunlight in every playing condition. The interior thermal lens features 3M Foam Sealant, trapping a layer of cool barrier of insulating air, eliminating condensation and encouraging evaporative cooling. Details Anti Fog Thermal Layer Optical Grade Polycarbonate