Captain O-Ring Firearms & Hunting O-Ring Manuals

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Note:  Guides must be printed at "Actual Size" in order for printed o-ring sizing to be accurate.

American Air Arms Rebuild Guides

Slayer .357

Crosman Rebuild Guides

​Benjamin 392, 397, C9, CB9 (1195-2016)
Benjamin Armada .22 BTAP22MX
​Benjamin AS392T
Benjamin Discovery BP1K77/BP9M22
Benjamin Marauder BP1763/1764 & BP2263/2264
Benjamin Marauder BP2200
Benjamin Marauder BP2563/2564
Benjamin Maximus .177 & .22
Benjamin PCP Hand Pump
​Bulldog 357
​Challenger CH2009
RepeatAir Model 1077

FX Rebuild Guides

FX Impact (.177, .22, .25, .30)

Umarex Rebuild Guides

Gauntlet (.177 & .22)