Pre-Tuned System
| Engine(s) Fitted | Price | Stock # |
|---|---|---|
| .25 Engines | 63.95 | |
| O.S. .25-.32 FX, SX & FSR Magnum .25-.28 Pro TT Pro .25-.36 MDS .28-.38 FS Pro |
1910 | |
| S.T.G. AERO (bolt-through) | 1913 | |
| .40-.45 Engines | 70.95 | |
| K & B .40 | 1930 | |
| MVVS .40 | 1933 | |
| O.S. .40 FP Magnum GP .40-.44 Thunder Tiger .42 & .46 GP | 1936 | |
| O.S. .40-.45 FSR Royal .40-.45, ASP .40 | 1940 | |
| O.S. .40-.46 SF ASP .46 Royal .46 Thunder Tiger Pro .40-.46 MDS .40-.48 FS Pro | 1943 | |
| Rossi .40 & .45 | 1946 | |
| S.T. GS .40-.45 Como .40-.45 (bolt through) | 1950 | |
| S.T.S. .40-.45K (bolt on) | 1953 | |
| .61 Engines | 80.95 | |
| K & B .61 | 1970 | |
| OS .61 FX Thundertiger Pro .61 MDS .68 FS Pro | 1973 | |
| O.S. .61 SF (long-stroke) (non-pump) TT Pro .61 MDS .68 FS Pro | 1976 | |
| O.S. .60 & .61 FSR | 1980 | |
| Rossi .60 | 1986 | |
| S.T.S. .61 Como .61 (bolt through) | 1990 | |
| S.T.S. .61K (bolt on) | 1993 |
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