Folding spirit levels, RIS, WheelerFolding spirit level (libela) for mounting on rail Weaver/Picatinny from Wheeler Engineering. Spirit level (libela) helps to always hold in same (horizontal) position of the weapon during firing. This is achieved in the accuracy shooting higher due to the elimination panning point action against deliberate point. For airsoft guns it is also necessary to always shoot so that hop-up protuberance on its top. Any slope to cause undesirable lateral rotation of the projectile and thus a substantial inaccuracy when shooting at longer distances.
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