PETE'S PILLARS | CZ RIMFIRE MAGAZINE COMPONENTS
A Better Lead-In for Every Magazine Change.
The Pete's Pillars PP457SR replaces the factory plastic CZ magazine well spacer with a black-anodized, CNC-machined aluminum block featuring a generously radiused opening. It's a small, purposeful change that makes magazine insertion more forgiving at the range, on the bench, or in the field.
The magazine well is one of those details you notice most when you're using the rifle. With the original squared opening, a magazine has to meet the spacer more precisely. Our PP457SR Radiused Magazine Well Spacer Block provides a smoother, wider lead-in to help guide compatible .22 LR magazines into place. Whether you're changing magazines during an NRL22 stage, hunting in gloves, or working from a bench, the benefit is simple: less fuss finding the opening.
The Radius Makes the Difference
Unlike a standard square-edged spacer, the PP457SR has a rounded entry designed to help the magazine find its position without requiring such exact initial alignment. The improvement is especially welcome when making repeated changes or wearing gloves in colder weather. It doesn't change the purpose of the magazine well spacer; it makes the entry more accommodating.
Prefer the familiar factory opening? We make that option, too. The PP457SB OEM-Style Aluminum Magazine Well Spacer retains the traditional squared opening in a billet aluminum replacement. Choose PP457SR for the radiused lead-in, or PP457SB when keeping the original opening geometry is the priority.
Machined Aluminum, With the Pin Included
Each PP457SR is CNC-machined from 6061 billet aluminum and finished in black anodizing. It takes the place of the molded plastic magazine spacer with a rigid metal component while retaining the essential magazine-positioning role of the original assembly.
We also include a stainless steel retaining pin with the block. That's a useful extra when refreshing the magazine well assembly, rather than having to source a replacement pin separately. The existing magazine release, spring, and other components are not part of this kit.
The PP457SR is intended for compatible CZ 455, CZ 457, and CZ 512 rifles using the factory-style .22 LR magazine arrangement. It is designed as a straightforward replacement for the original spacer in nearly all standard configurations. Unusual or modified magazine housings may differ, so those setups should be checked individually.
Complete the Magazine Controls
The radiused spacer makes magazine insertion easier; an extended release can make the other half of a magazine change more accessible. Pete's Pillars manufactures the PP457MRB Extended Serrated Magazine Release for a more textured contact surface, alongside the PP457MRS Extended Smooth Magazine Release for shooters who prefer a clean, flat face. Check each release's listed model compatibility, particularly for CZ 512 applications.
Build Beyond the Factory CZ 457 Stock
Working on a CZ 457 rifle as a whole? Explore the traditional feel of the MDT Field Stock and KRG Bravo, or step into a competition-focused build with the MDT LSS Gen3 Competitor, MDT ACC Premier Gen2, or flagship MDT ACC Elite. These are CZ 457 stock and chassis choices, not fitment recommendations for the CZ 455 or CZ 512.
Find more replacement components and rifle upgrades in our CZ 457 Parts & Upgrades Collection.
Product Specifications
Manufacturer: Pete's Pillars
Part Number: PP457SR
Product: Radiused Magazine Well Spacer Block
Compatible Platforms: CZ 455, CZ 457, CZ 512
Magazine Application: Compatible factory-style .22 LR magazine systems
Material: CNC-Machined 6061 Billet Aluminum
Finish: Black Anodized
Magazine Entry: Enlarged Radiused Lead-In
Includes: One Magazine Well Spacer Block and One Stainless Steel Retaining Pin
Frequently Asked Questions
Fitment, magazine compatibility, included hardware, and choosing the right spacer.
What does the radiused opening actually do?
It gives the magazine a more forgiving lead-in than the standard squared opening. The radius helps guide a compatible .22 LR magazine into position, particularly when changing magazines repeatedly or wearing gloves.
Will PP457SR fit my CZ 455, CZ 457, or CZ 512?
Yes, PP457SR is designed as a direct replacement in the factory-style .22 LR magazine well arrangements used on compatible CZ 455, CZ 457, and CZ 512 rifles. It fits nearly all standard setups. Nonstandard magazine housings and modified configurations can require individual fit verification.
Can I use PP457SR with .22 WMR or .17 HMR magazines?
No. The PP457SR is designed for compatible .22 LR magazine arrangements and is not intended for use with .22 WMR or .17 HMR magazines. The magazine configuration matters, even when the rifle model is otherwise compatible.
Does the magazine well block include the retaining pin?
Yes. Every PP457SR includes the black-anodized aluminum spacer block plus a stainless steel retaining pin as an added value. The magazine release, spring, and remaining magazine housing components are not included.
What's the difference between PP457SR and PP457SB?
PP457SR has a radiused, more forgiving magazine entry to make insertion easier. PP457SB uses a squared, factory-style opening. Both replace the plastic spacer with CNC-machined aluminum; choose the opening style that suits your preference.
Will PP457SR still work if my CZ 457 has an aftermarket stock or chassis?
In most cases, yes, if the rifle retains the compatible factory-style .22 LR magazine well assembly. The key consideration is the magazine housing configuration, not simply the stock or chassis brand. If your build uses a modified or nonstandard magazine housing, confirm the configuration before ordering.
A smoother magazine entry. Machined aluminum. Stainless retaining pin included.
Pete's Pillars. Small Change. Big Impact.
