CZ 457 Bolt Shim Kit
Fine-tune the bolt-to-barrel fit of your CZ 457 rimfire rifle with this bolt shim kit. Installed between the bolt and bolt handle assembly, these shims allow controlled adjustment of bolt headspace to better suit the rim thickness of your chosen ammunition.
Factory rifles are built with tolerances that accommodate a wide range of ammunition. For shooters seeking a more consistent setup with a preferred .22 LR, .22 WMR, or .17 HMR load, bolt shims provide a practical way to test and refine the fit. Correctly adjusted headspace can help reduce variation and support more consistent accuracy.
Available in two four-piece assortments:
Metric kit — Position7
Includes one shim of each thickness:
- 0.03 mm
- 0.05 mm
- 0.10 mm
- 0.15 mm
Imperial kit — TriggerShims
Includes one shim of each thickness:
- 0.002 in
- 0.003 in
- 0.004 in
- 0.005 in
Kit comparison
| Kit | Colour code | Metric thickness | Imperial thickness |
|---|---|---|---|
| Position7 Metric | Black | 0.03 mm | 0.00118 in |
| Position7 Metric | Green | 0.05 mm | 0.00197 in |
| TriggerShims Imperial | Black | 0.0508 mm | 0.002 in |
| TriggerShims Imperial | Blue | 0.0762 mm | 0.003 in |
| Position7 Metric | Blue | 0.10 mm | 0.00394 in |
| TriggerShims Imperial | Purple | 0.1016 mm | 0.004 in |
| TriggerShims Imperial | Red | 0.1270 mm | 0.005 in |
| Position7 Metric | Red | 0.15 mm | 0.00591 in |
Compatibility
- CZ 457 rimfire rifles
- Suitable for .22 LR, .22 WMR, and .17 HMR variants
Important
Bolt headspace adjustment should be performed carefully and checked for safe, correct function. If you are not experienced with rifle disassembly or headspace setup, have installation carried out or verified by a qualified gunsmith.
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