NRL22 chassis build (Varmint / Pro-Varmint SR donor)
Parts total: ~$850 (as of Oct 2026; excludes rifle, optics, ammo, tax, shipping)
| ID | Part | Price |
|---|---|---|
| C001 | KRG Bravo CZ-457 (includes mag-well insert) | $399.99 |
| C021 | Timney CZ457 trigger | $174.99 |
| C041 | EGW HD CZ 457 rail, 20 MOA (80932) | $89.99 |
| C059 | Anarchy extended mag release | $24.99 |
| C057 | MKM 10+3 extension (x2) | $34.98 |
| C072 | MDT Oryx bipod | $99.99 |
| C063 | Area 419 M6x1 bolt knob | $24.99 |
| Total | ~$850 |
Why: - The Bravo is the most-sold 457 chassis and shares accessories with the T1x Bravo (T1x crossover: same chassis family, LOP kit and bipod). - Timney gives a crisp 10 oz-2 lb single-stage break. - The extended release addresses the hard-to-reach mag release in chassis (known_issues #8). - The larger knob helps fast bolt work.
Alternates: - MDT Oryx C002 ($449.99) - XLR Element 4.0 C009 ($424, RH only) - Grey Birch La Chassis 457 C011 ($524.99)
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 |
|---|---|---|---|---|---|---|
| C001 | KRG Bravo Chassis Rimfire - CZ-457 inlet chassis/stock | All CZ 457 (RH unless noted); NOT CZ 455 | $399.99 | high Manufacturer lists CZ-457 inlet | Ships with mag-well insert; Harris stud, L2 rail, 1-3 LOP spacers; uses factory CZ mags. Black/FDE/Sako Green/Stealth Grey Source: https://kineticresearchgroup.com/product/bravo-chassis-rimfire/ · checked 2026-10-10 | View at retailer |
| C021 | Timney CZ 457 trigger (CZ457 curved / CZ457-ST straight) trigger | CZ 457 RH & LH; NOT CZ 455 (separate $159.99 model) | $174.99 | high Manufacturer page | Single-stage, 10 oz-2 lb, factory 1 lb, SEAL'd sear lock, UPC 081950457007 Source: https://timneytriggers.com/cz-457/ · checked 2026-10-10 | View at retailer |
| C041 | EGW HD CZ 457 one-piece Picatinny rail (80930 0 MOA / 80932 20 MOA) scope mount | All CZ 457 (LH option 4-6 wk) | $89.99 | high Manufacturer page | Clamps 11 mm dovetail Source: https://egwguns.com/hd-cz-457-picatinny-rail-mount-0-moa · checked 2026-10-10 | View at retailer |
| C059 | Anarchy Outdoors CZ rimfire extended magazine release Gen II magazine | CZ 452/455/457 (not with metal mags) | $24.99 | high Maker page | Works with factory bottom metal Source: https://www.anarchyoutdoors.com/cz-rimfire-rifle-extended-magazine-rel · checked 2026-10-10 | View at retailer |
| C057 | MK Machining CZ 455/457 +3 extension (5+3 and 10+3 versions) magazine | CZ 455/457 | $17.49 | high Manufacturer page | Nylon 11; uses factory spring/follower Source: https://www.mkmachining.com/product/carbon-fiber-nylon-cz-455-4573-ext · checked 2026-10-10 | View at retailer |
| C072 | MDT / KRG Universal: MDT Oryx bipod ($99.99), Ckye-Pod Gen3 ($599.99), KRG tool-less LOP ($52.99) accessory | Platform-agnostic | see T1x parts P063-P065 | high Verified in T1x pass | Source: /workspace/rimfire/t1x/parts.csv · checked 2026-10-08 | View at retailer |
| C063 | Area 419 Bolt knob (M6x1 thread) bolt | All CZ 457 (and Bergara) | $24.99 | high Retailer page quoting maker | Page states 'CZ 457 bolt knobs are threaded M6x1' Source: https://www.anarchyoutdoors.com/area-419-m6x1-thread-bolt-knob/ · checked 2026-10-10 | View at retailer |
| C002 | MDT ORYX Chassis System - CZ 457 chassis/stock | All CZ 457 (RH unless noted) | $449.99 | high Shopify catalog variant 'CZ 457' | Black/FDE/ODG/Gray variants Source: https://mdttac.com/products.json · checked 2026-10-10 | View at retailer |
| C009 | XLR Industries Element 4.0 Chassis - CZ-457 Rimfire (RH only) chassis/stock | CZ 457 RH | $424.00 | high Shopify variant | Source: https://xlrindustries.com/products/element-chassis.json · checked 2026-10-10 | View at retailer |
| C011 | Grey Birch MFG La Chassis 457 (10 in forend); M81 camo version chassis/stock | All CZ 457 (RH unless noted) | 524.99 / 599.99 (M81) | high Manufacturer category listing | Made in Tampa, FL Source: https://gbmfg.co/la-chassis/ · 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.