O Rings for Remington model 11-87 ??

Does anyone know what size the O rings are for a Remington model 11-87
12 gauge
Or know where I can get some??

Viton # 21 o ring is the proper o ring for rem 1100 ,11 87 12ga guns it is also the correct o ring for the standard weight 1100 20ga gun . should be available from most hard ware stores or hydraulic hose and fitting shops . also see them offered by one of the members of this site in the EE .
 
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