CZ-USA Will Offer 7.62×39 527 Receiver Assemblies For Sale

Good news for those looking for a micro-action custom hunting rifle; CZ USA has just
announced they are making available 7.62×39 CZ 527 unbarreled actions to the US
consumer market. From Jerking the Trigger:

CZ USA has announced that they will be making their CZ 527 7.62ร—39 actions available for purchase separately. This will allow shooters to build their own custom 6.5 Grendel chambered rifle on the proven โ€œmicro Mauserโ€ actions. The potential for such an action to be built into a light precision or hunting rifle is off the charts.

As Matt mentioned in the article, the receivers are not available through CZ’s website; if any of our readers are interested, click through the link to Jerking the Trigger for more information.

The 527 is a micro-length (2.26″ OAL) rifle chambered in such cartridges as the .223
Remington and 7.62×39. The action is a true Mauser-style mechanism, complete with
large claw-type extractor on the side. It features CZ’s signature “push forward” set
trigger, which makes for an incredibly light trigger pull.

Nathaniel F

Nathaniel is a history enthusiast and firearms hobbyist whose primary interest lies in military small arms technological developments beginning with the smokeless powder era. In addition to contributing to The Firearm Blog, he runs 196,800 Revolutions Per Minute, a blog devoted to modern small arms design and theory. He is also the author of the original web serial Heartblood, which is being updated and edited regularly. He can be reached via email at


  • BattleshipGrey

    Does this mean that since they’ve never been assembled as rifles, we could make them into pistols instead? ๐Ÿ™‚

    • John Daniels

      I believe so, yes. 6.5 Grendel silhouette pistols, perhaps.

      • sam

        Nifty! I was wondering this as well.

  • TheBanker

    6.5 Grendel bolt gun!

    • I suppose. Is there much demand for such a creature?

      • echelon

        You’d be surprised. My dad and I are both Grendel hunting enthusiasts and this is just up our alley.

      • ostiariusalpha

        Yes, there absolutely is. Due to the AR-15 bolt’s limitations when dealing with the larger bolt face required for a round like the Grendel, they underload the factory cartridges to keep the pressure down. The Grendel can actually perform to it’s full potential in a well made bolt action, not to mention the increase of inherent accuracy they offer. A light, handy rifle with a short bolt throw that will harvest a whitetail without difficulty; what’s not to like?

        • LilWolfy

          The bolt isn’t the limiting factor, the barrel tennon diameter in the AR15 is. AA has the same bolt in the pressure-test apparatus still running after years of proof load testing, where pressures are in the 67,000psi region.

          If the metallurgy on the bolt is done right, the bolts are fine. Trying to push pressures much higher than SAAMI doesn’t make a lot of sense for a bottle-necked 6.5mm with a 35gr H2O case capacity.

          You can get a 129gr to go 2640fps from a 21″ bolt gun when hand-loading. The availability of factory ammo that is affordable is still a major allure to the bolt Grendel because there is very little recoil, and you can now have a micro-lite rifle with a lot of retained energy.

          I’ve been wanting a micro action Grendel for my kids for a long time now without having to mess with the Russian short cartridge barrel. Grendel is 3-4 times efficient as the 7.62×39 when you look at range, starting with the same bullet weight and mv.

          • ostiariusalpha

            Heh, you are right. I let myself forget that it’s the yield strength of the chamber that limits the AR-15 from really using the Grendel at optimal pressure. Hoop stress aside though, I think a bolt with thicker walls around the bolt face to support the lugs will be generally more forgiving of variance in manufacturing quality; not everyone buys AA hard use bolts & even AA can’t guarantee that every bolt will be as perfect as that proof load bolt.

        • Just seems like the cost of a custom-built 6.5mm Grendel bolt gun would have a hard time competing with all of the budget bolt-actions that are available in the $300-400 range.

          It’s just a very small niche to fill.

      • I’d build one. ๐Ÿ˜‰

      • sadlerbw

        When I decided I wanted a 6.5 Grendel, I actually wanted a bolt gun on a micro action, but that was going to be a pretty big custom-gunsmith project. I had actually considered buying a whole 527 and throwing the barrel away! Instead, I ended up building an AR. The AR is fun, but the bolt is a known weak point. I would have preferred a bolt gun, or even an AR like the Mutant where they used an AR-15 mag well with an AR-10 bolt and barrel extension, but neither were readily available.

  • Rick Andresen

    What calibers will this be available in? Are there many aftermarket stocks? Barrels?

    • Since they are not barreled, the actions can be in any caliber that shares a case head with 7.62×39.

      The actions are easily barreled by a gunsmith, and stocks are available.

      • Vitsaus

        Who is making the barrels for this? Or does it share a barrel with some other design as well?

        • John Daniels

          You’ll have to get a barrel made by a shop that specializes in that, and have it fit to your action by a gunsmith. This isn’t like a Savage action where you can just buy a prefit barrel, and headspace it with a barrel nut.

        • The AR market has everyone spoiled, I see. ๐Ÿ˜‰

          I’d order a barrel from Douglas or another good barrelmaker, and have a gunsmith barrel the action for you. Given how headspace is set on Mausers, I don’t know that you actually can drop in a barrel like you would an AR or T/C Dimension or something. That’s the price you pay for the Mauser’s clean lines!

          • Rick Andresen

            So how much would it cost to buy a stock and barrel and get all the work done? I was hoping it was diy project but apparently not

          • John Daniels

            Plan on about $300-$400 for the barrel, about as much for the stock. You’re looking at about a thousand dollar rifle, if you do it right. This is not something an average person can do in a garage. This requires a real gunsmith with a real lathe.

    • Kelly Jackson

      There aren’t a ton of aftermarket stocks for the 527 and the factory CZ ones are pretty expensive.

      Boyd’s Stocks is probably your only source for a stock for this action.

  • John Bear Ross

    6.5 Grendel or .50 Beowulf, as well as 7.62×39. Nice niche market for the right entrepreneur.

  • iksnilol

    So much want. One short integrally suppressed barrel in 7.62×39 and one longer heavy barrel in 6.5. Just gotta check now the ease of barrel change for these rifles.

    Could have a good/decent hunting, plinking and long distance rifle on one set of papers.

  • Henry C.

    As a gunsmith who loves the 7.62×39 cartridge, this is amazing news! I’m curious what the pricing is gonna be like. I can finally build a 7.62×39 scout rifle.

    • SD3


  • Kitsuneki

    Would be better if it could feed from Glock magazines

    • Blake

      Please tell me that was a joke? ๐Ÿ™‚

    • CrankyFool

      Yeah, if it could use standard Glock 7.62×39 magazines, that’d be a huge upside.

  • Blake

    This proves yet again that the folks at CZ-USA are as good at developing unique business opportunities as the Czechs are at building excellent firearms.

    They’ve done several surveys in the past & had a lot of demand for a 6.5 Grendel bolt rifle, but perhaps not enough to make the numbers work for a production, import, & marketing run. Also ammo availability isn’t quite there yet.

    This allows them to cater to that market without having to change anything on their production line.

    They fully recognize that a lot of folks that are motivated enough to want a 6.5 Gren are motivated enough to build one or have one built. This also opens the door for custom builders to start making all kinds of other interesting rifles on this fantastic little action.

    Personally I think an integrally suppressed bolt gun in 9x39mm would be the bee’s knees.

  • Grindstone50k

    Not a hunter (yet?) but I would love to have one (or more) of these just for the opportunity to build something beautiful and unique.

  • H65

    Does anyone have solid info on the actual mag coal? 2.26″ is not the number a bolt Grendel handloader wants to see.

  • Southpaw89

    If these guys would make a left handed 527 carbine I would put all other projects on hold until I could afford one. I do like the idea of them selling the action only though.

  • Southpaw89

    Not the carbine though, and not in 39, if I’m going to fork over the money for a new rifle it has to be exactly what I want.