Two-caliber "one action, many barrels" kit (any 457 in a varmint-channel stock)
Parts total: ~$771 (as of Oct 2026; excludes rifle, optics, ammo, tax, shipping)
| ID | Part | Price |
|---|---|---|
| C032 | CZ MTR SR barrel set .22 LR 20in (match chamber, 1/2x28) | $409.00 |
| C031 | CZ Varmint SR .17 HMR 24in barrel set | $299.00 |
| C053 | Extra 10-rd .22 WMR/.17 HMR mag | $48.35 |
| C066 | Bolt shims (headspace each barrel) | ~$15 |
| Total | ~$771 |
Why: - This showcases the interchangeable barrel system, the 457's key differentiator vs the T1x (whose barrel is not designed for user swapping). - Each CZ barrel set includes a 5-rd mag and insert. - CZ's manual still says minisets should be fitted and gauged by a gunsmith (known_issues #3).
Stock check: heavy/MTR barrels don't fit American/Lux/Premium/Training/Jaguar/Royal stocks (CZ chart).
Parts list with retailer links
Every part referenced in this build (including swaps/alternates). Confidence reflects how well fitment/price was verified.
Product links go to retailers and may be affiliate links; we may earn a commission. Prices as of Oct 2026. Affiliate disclosure
| ID | Part | Fits | Price | Confidence | Notes | Link |
|---|---|---|---|---|---|---|
| C032 | CZ (OEM) 457 MTR barrel sets: MTR 20in; MTR SR 16.5/20/24in; Long Range MTR SR 20in barrel | All CZ 457 (RH unless noted) (.22 LR MATCH chamber) | 399 (MTR 20) / 409 (MTR SR) / 355 (LR MTR SR) / 317 (Varmint MTR 20.6 threaded) | high Official | Best value 'match' upgrade for any 457; CZ manual says minisets should be headspace-checked/fitted by a gunsmith Source: https://shop.cz-usa.com/cz-products/rifles/457-barrel-sets.html · checked 2026-10-08 | View at retailer |
| C031 | CZ (OEM) 457 American SR 20in (00311-00313) & Varmint SR 16.5/24in (00314, 00317, 00319) barrel sets barrel | All CZ 457 (RH unless noted) | $299.00 | high Official | SR = suppressor ready (1/2x28) Source: https://shop.cz-usa.com/cz-products/rifles/457-barrel-sets.html · checked 2026-10-10 | View at retailer |
| C053 | CZ (OEM) 5-rd / 10-rd polymer .22 WMR/.17 HMR magazine | All CZ 457 (RH unless noted) .22 WMR/.17 HMR | 39.95 / 48.35 | high Official | Source: https://shop.cz-usa.com/mag-cz-455-512-22wmr-10-rd-poly12011.html · checked 2026-10-08 | View at retailer |
| C066 | Triggershims.com (via Kurt the Gunsmith) CZ 457 bolt headspace shims bolt | All CZ 457 (RH unless noted) | <15 (per article) | med Single gunsmith blog with measurements | Measure headspace first; shims reduce firing-pin protrusion Source: https://kurtthegunsmith.com/cz-457-accuracy-the-most-affordable-way-to · checked 2026-10-08 | View at retailer |
Before you buy
Part IDs refer to parts.csv (C###). Prices are USD list/street prices on 2026-10-08 and exclude rifle, optic, ammo, tax and shipping. Rifle reference MSRPs (CZ US, variants.csv):
- Scout $649
- American Synthetic SR $679
- American $729
- Lux $749
- Varmint $799
- Pro-Varmint SR $849
- Varmint MTR $999
- AT-ONE $999
- Manners MTR / Precision Chassis MTR $2,399
Rules for every build: - Buy 457-specific stocks, triggers and rails. CZ 455 versions don't fit; only barrels and mags interchange. - Stock screws: 3.5 Nm. Barrel screws: 5.5 Nm, tightened after the mag-housing screw. - Headspace-check every barrel swap. - US threads are 1/2-28; non-US barrels are 1/2-20.