My CZ457 pro 20" likes eley. .113 MOA at 50, and for general plinking, subsonic cci was 1.2 MOA at 100, 2.5 MILS up, 0-10 MPH wind. The factory test target that came with gun was 11mm group at 50M. Factory stock gun except for McRee chassis. I also got a pro varmint 16" threaded barrel one, which also has an 11mm group on factory 50M test target. Put it in a McRee chassis but have not fired it yet.
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CZ 457
- Thread starter A-Rob
- Start date
I bedded a 457 (16") for my daughter and it shoots fine but we too are looking at chassis now.
It likes the SK Red box. Not sure what that group measures, but this is at 100Y
It likes the SK Red box. Not sure what that group measures, but this is at 100Y
Been guilty of not shooting the CZ enough since I had it completed late July early August of this year. I needed to zero some rifles this Christmas morning so I took her out. I still plan on getting the ACC Gen 2 for it.
I had one box of Polar Biathlon left over from my Vudoo and surprisingly the CZ shot well with it. Attached are two back to back groups with the Lapua before I moved onto another rifle to square away.
Edit: pics finally added
I had one box of Polar Biathlon left over from my Vudoo and surprisingly the CZ shot well with it. Attached are two back to back groups with the Lapua before I moved onto another rifle to square away.
Edit: pics finally added
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Interesting to see you are running an arca rail on the La Chassis. Are you doing that to try to stiffen the forearm up? If so, how is that working? On my wife's build that is my only knock on the La Chassis would be the flex in the forearm. I kind wish they would look at making something like a competition forearm that would have more wall thickness to stiff it up and even a bit wider to give you better stability. However, I do understand to build a chassis that light you have to give something somewhere. I like Grey Birch's modular design because it allows them to create use specific forearms and butt stocks in the future.
I like how he hung a coil of garden hose off the front to act as a counter balance. 
Water was running as well, that's fluid dampened harmonics man.I like how he hung a coil of garden hose off the front to act as a counter balance.
The GB La Chassis was never intended for a truck axle barrel. The forend is super flexy so the add-on arca rail helps a little but the flex is definitely still there. Honestly it’s place holder right now until I can get off my ass and order the Gen 2 ACC.
There's another CZ comp chassis coming in the next couple weeks.
Finally got to shoot the test brick of Lapua Polar Biathlon I got from Whidden. I think I found a lot that the CZ likes.
Both groups are back to back with the same lot. There was a very subtle breeze. Distance was 100y.
Both groups are back to back with the same lot. There was a very subtle breeze. Distance was 100y.
Got the DPG extractors in this afternoon. They were a bitch and a half to install because of the thickness. Get ready for some cussing. You have to work to get the factory spring over the edge of the extractor.
I was having intermittent failure to extract. Not enough to piss me off but it happened on occasion. The points of the new claws are sharp and bolt close is a little firm but hopefully it’ll wear in a bit.
For giggles the factory claw thickness is about 0.074” and the new ones are roughly 0.077”.
I cycled a few rounds and had no issues. The brass has little marks from the claws. Live fire will happen tomorrow.
PS- yes I need lotion.
I was having intermittent failure to extract. Not enough to piss me off but it happened on occasion. The points of the new claws are sharp and bolt close is a little firm but hopefully it’ll wear in a bit.
For giggles the factory claw thickness is about 0.074” and the new ones are roughly 0.077”.
I cycled a few rounds and had no issues. The brass has little marks from the claws. Live fire will happen tomorrow.
PS- yes I need lotion.
Looking forward to the review! I'd love an option to extract live rounds from tight chambers.
Did a quick range session this AM to confirm that the “good lot” wasn’t just a fluke yesterday and to check the function of the new extractors.
The stars must have been aligned because I shot probably my tightest group ever. Not shown but the other four 5-shot groups were 0.290”, 0.385”, 0.204”, and 0.260” in no particular order.
The same lot also did really well at 100y again. The reason I wanted to shoot what I had left of the testers to confirm.
As far as the extractor, it worked 100%. Closing the bolt handle is still stiff but it’s not bad. On the OEM extractor I noticed the brass ejecting out to the side in a nice arch. The brass now comes out and down or out and around the 2 o’clock. I know it’s not an AR but just wanted to see how it ejected. I extracted live and fired Lapua no problems.
Pictures from today and video of the bolt function and ejection.
The stars must have been aligned because I shot probably my tightest group ever. Not shown but the other four 5-shot groups were 0.290”, 0.385”, 0.204”, and 0.260” in no particular order.
The same lot also did really well at 100y again. The reason I wanted to shoot what I had left of the testers to confirm.
As far as the extractor, it worked 100%. Closing the bolt handle is still stiff but it’s not bad. On the OEM extractor I noticed the brass ejecting out to the side in a nice arch. The brass now comes out and down or out and around the 2 o’clock. I know it’s not an AR but just wanted to see how it ejected. I extracted live and fired Lapua no problems.
Pictures from today and video of the bolt function and ejection.
Cool! Are the extractors hitting the relief grooves in the barrel and being forced outward on bolt close? DPG might have different dimension grooves than on your barrel (looks like MCR?).
I believe that’s what they are doing. DPG discloses that bolt close will be harder than normal. Yup MCR.
The new claws are much thicker and definitely add a great bit of tension on the spring which is evident when you install them. I’m pretty positive that plays a role in the added force.
The two CZ's I've had extraction issues with have had aftermarket barrels. Swapping extractors fixed one of them. The other (Lilja) is beyond help to get it 100% it would seem.
I do have a good friend who is competent that has a factory CZ that cannot extract/eject reliably.
The vast majority of CZ's are fine out of the box, but no product is ever 100%. There is a need for replacements since CZ supply chain cannot seem to keep up.
I do have a good friend who is competent that has a factory CZ that cannot extract/eject reliably.
The vast majority of CZ's are fine out of the box, but no product is ever 100%. There is a need for replacements since CZ supply chain cannot seem to keep up.
I have a Tikka T1X in a woox Furiosa and a cz 457 varmint mtr. Both get shot in PRS rimfire, cz is base class and the Tikka is open. If you plan on shooting PRS or NRL22 with it make sure you get the Furiosa ultra forend as the regular Furiosa forend gets pretty tall when you have an arca rail stuck under it which makes it harder to thread into and out of barricades. Also the longer length from the ultra forend will help with balance, I do like the regular Furiosa grip a lot but haven't held the ultra grip.
Fwiw I'm going to take my Tikka in a different direction and make it light by swapping a grey birch la chassis with a 16" handguard and I'm considering a carbon barrel and going with a lighter scope also.
I did extend my CZ forend because the foundation universal arca rail was much longer than the stock and I had issues snagging it on barricades a couple times so this will hopefully make it a little less likely to get hung up on goofy barricades. (It's mounted to the rail only so technically it isn't a stock modification, just a rail mounted weight)
Sweet!! I'm going to call Wooks to see if the can make the ultra for a 457
I’m sure a few of us caught wind of it a while ago but had to stay tight lipped myself included. Well it’s official now.
MPA CZ457 Vanquish Chassis - MasterPiece Arms, Inc.
Please allow 8-12 weeks for delivery from date of order. Custom Cerakote Colors add $135 for the chassis body and $65 for the barreled action. Check with MP Edit snippet
masterpiecearms.com
Technically announced today. I'll have some photos tomorrow and then it'll be at shot show next week
I’m still waiting on confirmation to see if the v-block portion can clear a 1.25” barrel just forward of the front action screw.
Lefty here with machines, I machine my RH chassis and stocks to accept left hand bolt and widen the RH saftey lever area .020 for the RH Timney and Jard,so as to clear bolt stop.Not hard.
PDC customs will make a CZ457 ambi able to run RH safety past bolt stop.He had two to make that way when I talked to him.
Mine's in a Grey Birch LH chassis, balances well without a ton of weight added up front. MPA makes a great chassis, just wondering why they did it in the Vanquish and not something with a lighter buttstock...not everybody wants to run a 24x1.25 barrel just to help weight balance their rig
I’m sure a few of us caught wind of it a while ago but had to stay tight lipped myself included. Well it’s official now.
MPA CZ457 Vanquish Chassis - MasterPiece Arms, Inc.
Please allow 8-12 weeks for delivery from date of order. Custom Cerakote Colors add $135 for the chassis body and $65 for the barreled action. Check with MP Edit snippetmasterpiecearms.com
Kinda expensive compared to other chassis options, even from MPA. It's even way more expensive than Manners stock. Wonder why that is?
One of my buddies recently installed the L3i barrel on CZ457. He has the Manners stock and had open up the barrel channel a bit to accommodate the new barrel.
I like the simplicity of the butt stock adjustments
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And I’m going to ask this on every new chassis for the 457 that is coming out.. will the vblock area just forward of the front action screw allow for a 1.25” barrel to seat without touching anything? Let’s jog people’s memory with the attached picture.
Spoke too soon in my earlier post, questioned the Vanquish as the right chassis for a rimfire gun. Apparently MPA added 6oz to the forend while removing 1lb from the buttstock compared to the center fire version. That and the new mag release are big upgrades. The barrel channel is stated to be 1.350in inlet, hopefully that includes inletting directly forward of the front action screw. Looks like they did their homework on this project. And in a LH inlet also...don't know that I'll jump out of my Grey Birch right away, but I'm certainly going to follow the feedback once the first one's are seen in the wild.
Grey Birch said the same but didn’t account for the area a cunt’s hair away from the front action screw. They just thought about the forend and not the vblock.
Unofficially there is a small batch of lefty that will hit the site in about a week and half. These if ordered when they hit the site would ship in Feb.
Took my CZ457 MTR that's been rebarreled with a Pete's Pillars barrel to the range today for 100 yards zero. While I was there I tested an EC Tuner V2. Only shot 25 rounds of Eley Semi Auto Bench Rest ammo. Last 5 of 25 shots playing with the tuner at 100 yards. The tuner came home with me.
I think the new chassis from L3I is a scam. First, he has all this cool shit for our rifles, bottom metal, barrels that won’t fit our channels, etc, so we go buy all that stuff. Then after we have fully kitted out our rifles, he comes out with a chassis that has all that good stuff built in. I think it was his plan all along! Well, I for one, am not falling for it! But, I will ask for a friend, when will they be available, and what is the price? 
