| 摘要 |
Rifle front and rear flip up sights include a base member attached to the gun with a sight arm pivotally attached to the base member and being biased pivotally downwardly from one end of the base member while a support member is biased pivotally upwardly from the opposite end with the free ends of each engaging each other in a locked condition when both are in their raised positions. The sight arm allows the support arm to be pivoted downwardly under the sight arm with the downward bias of the sight arm holding the sight assembly in a locked lowered position.
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