| Description: |
Autoloading rimfire rifle |
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| Introduction Year: |
1941 |
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| Year Discontinued: |
1970 |
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| Total Production: |
Approximately 764,573 |
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| Designer/Inventor: |
K. Lowe, C.C. Loomis |
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| Action Type: |
Autoloading |
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| Caliber/Gauge: |
.22 short, .22 long, .22 long rifle |
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| Serial Number Blocks: |
N/A |
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| Variations: |
Model 550A
Model 550P
Model 550-2G
Model 550-1 (Redesigned with only one ejector in 1946) |