| 摘要 |
The apparatus is an adjustable front sighting system for a shotgun. Interchangeable rings, each with a sight point mounted at a different height above the rings, are slipped over the discharge end of a tube attached to the muzzle of a shotgun and clamped in place by a threaded nut. The shotgun's elevation can thus be adjusted by interchanging rings with sight points at differing heights, and windage can be adjusted by rotating any installed ring in an arc to the left or right.
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