L3i Rifles | CZ 457 | 10 MRAD Extended Optics Base
More Room to Dial. More Room to Mount.
The USA-made L3i scope base gives your CZ 457 an extended Picatinny mounting surface, 10 MRAD (34.5 MOA) of built-in cant, and underside clearance for a 1.180-inch straight match barrel. It's a smart starting point for a rimfire rifle built to reach farther.
Start stretching a .22 LR beyond the usual rimfire distances and elevation becomes a major part of the optics decision. The L3i CZ 457 Extended Scope Base angles the optic by 10 MRAD, preserving more of the scope's upward adjustment for distant targets. For NRL22, PRS Rimfire and long-range practice, that means making better use of the elevation already inside your scope rather than changing mounts after the rifle is built.
There's another advantage when you're getting the scope into the right position: more rail in front of the receiver. The extended Picatinny section gives you room to position compatible rings or a one-piece mount for comfortable eye relief. Underneath, L3i has machined a relief cut to clear a 1.180-inch straight bull barrel—a useful detail if your build is moving toward the big match contours rather than a factory sporter barrel.
The base clamps to the CZ 457's factory 11mm receiver dovetail, so there is no need to drill the action. L3i machines it in the USA from billet 7075-T6 aluminum and finishes it in matte-black Type III hardcoat anodizing. It is substantial where an optics mount needs to be, without making the receiver the limiting factor in a heavy-barrel build.
Built Around Long-Range Rimfire
When an optic runs short of elevation, even a good scope can become frustrating at distance. This 34.5 MOA base is meant for shooters who know their rifle will spend time on smaller targets farther out. The generous forward footprint also makes it attractive for the one-piece mounts popular on precision rifles. You still get standard Picatinny compatibility for conventional rings.
Running a 1.180-inch barrel? L3i designed the underside of this rail with that exact heavy contour in mind. Pair it with their 24-inch 1.180-inch CZ 457 match barrel and consider a competition chassis such as the MDT ACC Premier Gen2 for the rest of the build. The scope base provides barrel relief at the receiver; the stock or chassis needs its own clearance for the full barrel.
Choose the Elevation That Fits Your Scope
Not every CZ 457 needs 34.5 MOA of cant. If your scope is staying closer to conventional rimfire distances, our own USA-made Pete's Pillars rails give you three simpler choices. The right rail is the one that leaves you enough scope adjustment for both your zero and the farthest targets you plan to shoot.
Pete’s Pillars 0 MOA RailFlat Picatinny base for general-purpose optics.
Pete’s Pillars 15 MOA RailA moderate cant for a mixed-distance CZ 457.
Pete’s Pillars 30 MOA RailOur higher-cant choice for long-range rimfire.Pair It With
A good scope mount starts with rings sized for your optic. If you're updating the barrel at the same time, our stainless retaining screws are a convenient way to refresh the receiver hardware as well.
MDT Premier 34mm Scope RingsMedium-height rings for compatible 34mm optics.
Warne Maxima QD 30mm RingsQuick-detach Picatinny rings for 30mm scopes.
PP457-48 Stainless Barrel ScrewsUSA-made replacement screws for CZ 457 barrel work.Finish Your Long-Range CZ 457
Build Around the Optics.
A scope base is one piece of a precision rimfire rifle. Explore heavy match barrels, purpose-built competition chassis, and a bipod for the positions you'll actually shoot from.
L3i | Heavy Match BarrelL3i CZ 457 24″ 1.180″ Match BarrelThe heavy straight contour this scope base was designed to clear.View Product →
Lilja | Match BarrelLilja CZ 457 24″ 1.180″ BarrelAnother full-diameter match barrel for a dedicated range build.View Product →
Pete’s Pillars | BarrelPete’s Pillars 22″ .960 Match BarrelOur own stainless .22 LR threaded match-barrel option.View Product →
MDT | Competition ChassisMDT ACC Premier Gen2 CZ 457A competition chassis with ARCA support and rifle-balance adjustment.View Product →
MDT | Competition BipodMDT Ckye-Pod Gen3 CompactA positional-shooting bipod for a more complete match setup.View Product →Key Specifications
Brand: L3i Rifles | Made in USA
MPN: L3I-SCB-CZ457-PIC
Platform: CZ 457 factory 11mm integral receiver dovetail
Elevation: 10 MRAD / approximately 34.5 MOA
Rail: Extended MIL-STD-1913 Picatinny for compatible rings and mounts
Barrel Relief: Scalloped underside for 1.180-inch straight match barrels
Construction: Billet 7075-T6 aluminum
Finish: Type III hardcoat anodize, matte black
Included: Scope base and hardened mounting clamp screws
Manufacturer Clamp Torque: 15 in-lbs
Tool: Mounting wrench not included
Build Your CZ 457 with Pete's Pillars.
We manufacture practical CZ 457 upgrades here in the USA and carry the barrels, chassis and optics hardware that give them a home.
Frequently Asked Questions
Does this L3i base fit the factory CZ 457 receiver?
Yes. It is designed to clamp to the CZ 457 factory 11mm integral dovetail and provides a MIL-STD-1913 Picatinny top for compatible scope rings and mounts.
What does 10 MRAD (34.5 MOA) cant actually do?
It angles the optic downward relative to the barrel, leaving more usable upward scope adjustment for longer shots. The cant does not add elevation to the optic itself or guarantee a particular shooting distance.
Can I still zero my CZ 457 at 25 or 50 yards?
That depends on your scope’s internal adjustment range and the rest of your mounting setup. A 34.5 MOA base is intended for longer-range use, so check your available downward adjustment if a close-range zero matters.
Will the rail clear a 1.180-inch straight bull barrel?
L3i machines relief into the underside specifically for clearance over a straight 1.180-inch match barrel, including its 24-inch CZ 457 heavy barrel. Stock, chassis and other accessory clearance are separate considerations.
Do I need to drill and tap the receiver?
No. The base clamps to the existing CZ 457 11mm dovetail with the included hardened screws. L3i specifies 15 in-lbs for its clamp screws; the mounting wrench is not included.
Can I use ordinary scope rings or a one-piece mount?
Yes, choose rings or a mount made for a MIL-STD-1913 Picatinny rail. The extended rail provides more fore-and-aft mounting space for ring placement and compatible one-piece mounts. Browse scope rings matched to your optic tube diameter.
How is this different from Pete’s Pillars 0, 15 and 30 MOA rails?
Is this a 3/8-inch dovetail mount for older CZ rifles?
No. L3i specifies this scope base for the CZ 457 factory 11mm dovetail. Do not treat it as a universal CZ 452, 455 or 3/8-inch dovetail rail.
What is the base made from and what comes in the package?
The rail is machined in the USA from billet 7075-T6 aluminum and has a matte-black Type III hardcoat anodized finish. It includes the scope base and hardened clamping screws; a mounting wrench is not included.
What should I build around a long-range CZ 457 optic setup?
A suitable barrel, stock or chassis, and stable shooting support matter as much as scope adjustment. Consider L3i’s 1.180-inch match barrel, the ACC Premier Gen2 CZ 457 chassis, and the MDT Ckye-Pod for a competition-oriented build.
Pete's Pillars is an authorized L3i dealer.
Small Change. Big Impact. Pete's Pillars.
L3i Rifles | CZ 457 | 10 MRAD Extended Optics Base
More Room to Dial. More Room to Mount.
The USA-made L3i scope base gives your CZ 457 an extended Picatinny mounting surface, 10 MRAD (34.5 MOA) of built-in cant, and underside clearance for a 1.180-inch straight match barrel. It's a smart starting point for a rimfire rifle built to reach farther.
Start stretching a .22 LR beyond the usual rimfire distances and elevation becomes a major part of the optics decision. The L3i CZ 457 Extended Scope Base angles the optic by 10 MRAD, preserving more of the scope's upward adjustment for distant targets. For NRL22, PRS Rimfire and long-range practice, that means making better use of the elevation already inside your scope rather than changing mounts after the rifle is built.
There's another advantage when you're getting the scope into the right position: more rail in front of the receiver. The extended Picatinny section gives you room to position compatible rings or a one-piece mount for comfortable eye relief. Underneath, L3i has machined a relief cut to clear a 1.180-inch straight bull barrel—a useful detail if your build is moving toward the big match contours rather than a factory sporter barrel.
The base clamps to the CZ 457's factory 11mm receiver dovetail, so there is no need to drill the action. L3i machines it in the USA from billet 7075-T6 aluminum and finishes it in matte-black Type III hardcoat anodizing. It is substantial where an optics mount needs to be, without making the receiver the limiting factor in a heavy-barrel build.
Built Around Long-Range Rimfire
When an optic runs short of elevation, even a good scope can become frustrating at distance. This 34.5 MOA base is meant for shooters who know their rifle will spend time on smaller targets farther out. The generous forward footprint also makes it attractive for the one-piece mounts popular on precision rifles. You still get standard Picatinny compatibility for conventional rings.
Running a 1.180-inch barrel? L3i designed the underside of this rail with that exact heavy contour in mind. Pair it with their 24-inch 1.180-inch CZ 457 match barrel and consider a competition chassis such as the MDT ACC Premier Gen2 for the rest of the build. The scope base provides barrel relief at the receiver; the stock or chassis needs its own clearance for the full barrel.
Choose the Elevation That Fits Your Scope
Not every CZ 457 needs 34.5 MOA of cant. If your scope is staying closer to conventional rimfire distances, our own USA-made Pete's Pillars rails give you three simpler choices. The right rail is the one that leaves you enough scope adjustment for both your zero and the farthest targets you plan to shoot.
Pete’s Pillars 0 MOA RailFlat Picatinny base for general-purpose optics.Pete’s Pillars 15 MOA RailA moderate cant for a mixed-distance CZ 457.Pete’s Pillars 30 MOA RailOur higher-cant choice for long-range rimfire.Pair It With
A good scope mount starts with rings sized for your optic. If you're updating the barrel at the same time, our stainless retaining screws are a convenient way to refresh the receiver hardware as well.
MDT Premier 34mm Scope RingsMedium-height rings for compatible 34mm optics.Warne Maxima QD 30mm RingsQuick-detach Picatinny rings for 30mm scopes.PP457-48 Stainless Barrel ScrewsUSA-made replacement screws for CZ 457 barrel work.Finish Your Long-Range CZ 457
Build Around the Optics.
A scope base is one piece of a precision rimfire rifle. Explore heavy match barrels, purpose-built competition chassis, and a bipod for the positions you'll actually shoot from.
L3i | Heavy Match BarrelL3i CZ 457 24″ 1.180″ Match BarrelThe heavy straight contour this scope base was designed to clear.View Product →Lilja | Match BarrelLilja CZ 457 24″ 1.180″ BarrelAnother full-diameter match barrel for a dedicated range build.View Product →Pete’s Pillars | BarrelPete’s Pillars 22″ .960 Match BarrelOur own stainless .22 LR threaded match-barrel option.View Product →MDT | Competition ChassisMDT ACC Premier Gen2 CZ 457A competition chassis with ARCA support and rifle-balance adjustment.View Product →MDT | Competition BipodMDT Ckye-Pod Gen3 CompactA positional-shooting bipod for a more complete match setup.View Product →Key Specifications
Brand: L3i Rifles | Made in USA
MPN: L3I-SCB-CZ457-PIC
Platform: CZ 457 factory 11mm integral receiver dovetail
Elevation: 10 MRAD / approximately 34.5 MOA
Rail: Extended MIL-STD-1913 Picatinny for compatible rings and mounts
Barrel Relief: Scalloped underside for 1.180-inch straight match barrels
Construction: Billet 7075-T6 aluminum
Finish: Type III hardcoat anodize, matte black
Included: Scope base and hardened mounting clamp screws
Manufacturer Clamp Torque: 15 in-lbs
Tool: Mounting wrench not included
Build Your CZ 457 with Pete's Pillars.
We manufacture practical CZ 457 upgrades here in the USA and carry the barrels, chassis and optics hardware that give them a home.
Frequently Asked Questions
Does this L3i base fit the factory CZ 457 receiver?
Yes. It is designed to clamp to the CZ 457 factory 11mm integral dovetail and provides a MIL-STD-1913 Picatinny top for compatible scope rings and mounts.
What does 10 MRAD (34.5 MOA) cant actually do?
It angles the optic downward relative to the barrel, leaving more usable upward scope adjustment for longer shots. The cant does not add elevation to the optic itself or guarantee a particular shooting distance.
Can I still zero my CZ 457 at 25 or 50 yards?
That depends on your scope’s internal adjustment range and the rest of your mounting setup. A 34.5 MOA base is intended for longer-range use, so check your available downward adjustment if a close-range zero matters.
Will the rail clear a 1.180-inch straight bull barrel?
L3i machines relief into the underside specifically for clearance over a straight 1.180-inch match barrel, including its 24-inch CZ 457 heavy barrel. Stock, chassis and other accessory clearance are separate considerations.
Do I need to drill and tap the receiver?
No. The base clamps to the existing CZ 457 11mm dovetail with the included hardened screws. L3i specifies 15 in-lbs for its clamp screws; the mounting wrench is not included.
Can I use ordinary scope rings or a one-piece mount?
Yes, choose rings or a mount made for a MIL-STD-1913 Picatinny rail. The extended rail provides more fore-and-aft mounting space for ring placement and compatible one-piece mounts. Browse scope rings matched to your optic tube diameter.
How is this different from Pete’s Pillars 0, 15 and 30 MOA rails?
Is this a 3/8-inch dovetail mount for older CZ rifles?
No. L3i specifies this scope base for the CZ 457 factory 11mm dovetail. Do not treat it as a universal CZ 452, 455 or 3/8-inch dovetail rail.
What is the base made from and what comes in the package?
The rail is machined in the USA from billet 7075-T6 aluminum and has a matte-black Type III hardcoat anodized finish. It includes the scope base and hardened clamping screws; a mounting wrench is not included.
What should I build around a long-range CZ 457 optic setup?
A suitable barrel, stock or chassis, and stable shooting support matter as much as scope adjustment. Consider L3i’s 1.180-inch match barrel, the ACC Premier Gen2 CZ 457 chassis, and the MDT Ckye-Pod for a competition-oriented build.
Pete's Pillars is an authorized L3i dealer.
Small Change. Big Impact. Pete's Pillars.
| Brand | L3i |
| Gun Platform | CZ 457 |
| Type | Scope Mount |