PETE'S PILLARS | CZ RIMFIRE MAGAZINE COMPONENTS
Factory-Style Fit. A Better-Made Replacement.
Keep the familiar CZ magazine opening while replacing the factory plastic spacer with a precision CNC-machined aluminum component. The USA-made Pete's Pillars PP457SB features the original squared entry profile, black-anodized 6061 billet construction, and an included stainless steel retaining pin.
Sometimes the best upgrade is the one that keeps a familiar design and improves the component behind it. The ejector spacer block plays a suprisingly large role in CZ 457 extraction and magazine feeding. Our PP457SB OEM-Style Magazine Well Spacer Block is made for compatible CZ 455, CZ 457, and CZ 512 rifles using the factory-style .22 LR magazine system. It replaces the original plastic magazine well spacer identified by CZ OEM part number 311233804014, while retaining the factory's squared magazine-entry geometry.
The Familiar Opening, Machined from Billet
PP457SB is CNC-machined from 6061 billet aluminum and finished with black anodizing. The rigid metal construction provides a durable replacement for an original spacer that is damaged, missing, or simply ready to be refreshed. It maintains the spacer's basic purpose: helping position the shorter .22 LR magazine within the compatible CZ magazine well assembly.
Unlike a radiused design, this spacer keeps the traditional squared opening. That makes it a natural choice for shooters who like the factory magazine-entry feel. Prefer an easier lead-in for magazine changes, especially at a match or when wearing gloves? Our PP457SR Radiused Magazine Well Spacer offers that alternative in the same black-anodized billet aluminum construction. Neither design is the universal choice; the difference is the entry profile you prefer.
A stainless steel retaining pin comes with every PP457SB. It's a useful added value when replacing the spacer and refreshing the magazine well assembly. The existing magazine release, spring, and other housing components are not included.
For standard, compatible CZ .22 LR magazine housings, PP457SB is intended as a straightforward direct replacement and fits in the great majority of factory configurations. A modified magazine housing or nonstandard conversion may have different requirements; the magazine arrangement is what matters, not just the rifle's model designation.
Complete the Magazine Controls
Refreshing the magazine well is a good time to consider the release you use with every magazine change. Pete's Pillars offers the PP457MRB Extended Serrated Magazine Release for a more textured contact surface, as well as the PP457MRS Extended Smooth Magazine Release for a clean, flat feel. Both are complementary CZ rimfire control upgrades; check their individual platform fitment before ordering, particularly on the CZ 512.
Take Your CZ 457 Build Further
For a broader CZ 457 upgrade, explore the traditional-stock ergonomics of the MDT Field Stock or KRG Bravo. Competition-focused builds can move to the MDT LSS Gen3 Competitor, MDT ACC Premier Gen2, or flagship MDT ACC Elite. These are CZ 457 stock and chassis options, not compatibility recommendations for CZ 455 or CZ 512 rifles.
Explore magazine components, bolt upgrades, replacement parts, and more in our CZ 457 Parts & Upgrades Collection.
Product Specifications
Manufacturer: Pete's Pillars
Part Number: PP457SB
Product: OEM-Style Magazine Well Spacer Block
Replaces CZ OEM Part: 311233804014
Compatible Platforms: CZ 455, CZ 457, CZ 512 (compatible magazine systems)
Magazine Application: Factory-style .22 LR magazine arrangement
Material: CNC-Machined 6061 Billet Aluminum
Finish: Black Anodized
Magazine Entry: Factory-Style Squared Profile
Includes: One Aluminum Magazine Well Spacer Block and One Stainless Steel Retaining Pin
Manufactured: USA
Frequently Asked Questions
OEM replacement reference, platform fitment, magazine systems, and choosing the right spacer.
What CZ OEM part does PP457SB replace?
PP457SB replaces CZ factory magazine well spacer part number 311233804014 in compatible .22 LR magazine assemblies. It retains the factory-style squared opening, using CNC-machined black-anodized aluminum in place of the original plastic spacer.
Does PP457SB fit CZ 455, CZ 457, and CZ 512 rifles?
Yes. PP457SB is designed for the factory-style .22 LR magazine well arrangements used in compatible CZ 455, CZ 457, and CZ 512 rifles. It directly replaces the original spacer in the great majority of standard configurations. Modified or nonstandard magazine housings should be checked for fit.
Does it work with .22 WMR or .17 HMR magazines?
No. PP457SB is for the shorter .22 LR magazine arrangement, not for use with .22 WMR or .17 HMR magazines. A rifle originally chambered in a magnum rimfire caliber may use this spacer when properly configured for the compatible .22 LR magazine system.
What is the difference between PP457SB and PP457SR?
PP457SB retains the original squared magazine opening for a factory-style feel. PP457SR has a radiused lead-in that makes magazine insertion more forgiving, particularly during repeated changes or when wearing gloves. Both use CNC-machined 6061 aluminum with black anodizing and include a stainless retaining pin.
Is the stainless steel retaining pin included?
Yes. The PP457SB includes the aluminum magazine well spacer block and a stainless steel retaining pin at no additional charge. The magazine release, spring, and other housing parts are not included.
Will PP457SB work with my aftermarket CZ 457 stock or chassis?
Yes, in most cases when the rifle retains a compatible factory-style .22 LR magazine housing. The housing configuration determines spacer compatibility; a chassis or stock name alone does not. If your rifle uses a nonstandard magazine well assembly, verify that arrangement before ordering.
Factory-style geometry. CNC-machined aluminum. Stainless retaining pin included.
Pete's Pillars. Small Change. Big Impact.
