This is a plastic alternate foresight for the Jag1 Crossbow. Having found it difficult to sight the JAG1 at 10m with a 40lb prod. I designed this as an alternative to a sight riser as the sights on the JAG1 are high enough already and any more rear elevation is difficult to get a comfortable head position, particularly for smaller people.
They are not the strongest due to how thin they are but they work well. Sold in 2's as it is expected that a knock on the foresight could break them.