The NEW CZ Bren 3 SD In .300 Blackout

Introducing the CZ Bren 3 SR in .300 Blackout

The video is filmed at CZ in the Czech Republic, where the host and Carell from CZ present a new rifle: the Bren 3 in .300 Blackout with an integrated suppressor housed in the fore-end. This configuration is referred to as an SD or SR (suppressor ready) style setup. The rifle is described as brand new, with no current users and no existing live-fire videos online. At this stage, only military variants exist, and they are not available in the United States. The focus of the segment is to establish that this Bren 3 configuration is a fresh development built around .300 Blackout and an integral suppressor system.

Design evolution from Bren 2 to Bren 3

Carell explains that the Bren 3 builds on the Bren 2, which is already in service with the Czech army and other forces such as Hungarian and Ukrainian units. The goal with Bren 3 was to reflect newer trends in military rifles and improve modularity and durability. The monolithic fore-end of the Bren 2 has been replaced with an M-LOK fore-end that allows easy changes of the fore-end, barrel, and gas setup. Users can switch between longer and shorter barrels and convert between 5.56 and .300 Blackout by swapping barrels, since both calibers share the same magazine and bolt head. The receiver uses 7075 aluminum reinforced with a steel inlay, and the bolt has been redesigned with two ejectors and an updated anti-bump system.

Gas system, charging handles, and suppressor-ready setup

The Bren 3 stock attachment and disassembly process have been revised based on user feedback, including input from Ukrainian soldiers. Unlike the Bren 2, the stock no longer needs to be removed for disassembly; it simply folds to the side, and the lower and bolt assembly are removed through the rear of the receiver. The gas system has also changed. Bren 2 used three positions: standard, adverse, and closed. Bren 3 replaces the closed position with a plus and minus setting, allowing finer tuning for different ammunition and suppressor configurations. The charging handle system is updated as well. The platform retains a non-reciprocating charging handle that can be configured on either side, with one side fixed and the other collapsible, enabling charging from both sides. The SR configuration in .300 Blackout is highlighted as well-suited for close quarters and very quiet operation with subsonic ammunition and the integrated suppressor from ATC or ATAC.

First live-fire with 200-grain subsonic .300 Blackout

The hosts move to the range in rainy conditions to demonstrate the Bren 3 SR in .300 Blackout. They initially intend to start with 124-grain supersonic ammunition but realize the loaded magazine contains 200-grain subsonic rounds instead. Firing the 200-grain subsonic .300 Blackout through the integrated suppressor produces a very quiet report and soft recoil impulse. The rifle cycles smoothly, and the shooter comments on how pleasant and soft the setup feels. This segment emphasizes the sound and recoil characteristics of suppressed subsonic .300 Blackout in the Bren 3 SR configuration, showing how well the platform handles heavy, slow projectiles with the integral suppressor.

Comparing subsonic and 124-grain supersonic performance

After shooting the 200-grain subsonic ammunition, the host switches to 124-grain supersonic .300 Blackout. The difference in sound and energy is immediately noticeable, with the supersonic rounds described as significantly louder and more energetic, even through the integrated suppressor. The rifle continues to function reliably, and the shooter remarks on how impressive the system feels with both load types. This portion of the video contrasts the quiet, soft-shooting nature of subsonic .300 Blackout with the sharper, more forceful character of 124-grain supersonic ammunition in the same suppressed Bren 3 SR platform.

Accuracy testing at 110 yards with subsonic and supersonic

The team then moves back to 110 yards, approximately 100 meters, to test accuracy and consistency. Using the 7-inch barrel Bren 3 SR, they start with 200-grain subsonic .300 Blackout, listening to the sound of the rounds traveling downrange and observing impacts on steel. One round appears to impact several feet to the right despite the dot being on target, which they note as an odd splash. They then transition to supersonic ammunition. At this distance, the rifle is described as very accurate, with supersonic loads hitting close to point of aim. The shooter mentions needing to hold slightly higher for subsonic rounds due to trajectory, while the supersonic rounds are essentially dead on, demonstrating the platform’s practical accuracy with both load types at 110 yards.

Final impressions and hopes for U.S. availability

In closing, the host praises the Bren 3 SR in .300 Blackout as a well-executed evolution of the Bren 2, highlighting the integrated suppressor configuration, modular barrel and caliber options, updated gas system, and improved disassembly and stock design. Carell confirms that Bren 2 production continues and that Bren 3 is still new, with no current users and ongoing contract work. The rifle is not yet available in the United States, and no specific timeline is given, though Carell notes they are working toward eventual availability. Viewers are encouraged to share their thoughts and interest, with the suggestion that strong feedback could influence how soon the Bren 3 SR reaches the U.S. market. The segment ends with mutual appreciation between Classic Firearms and CZ for the opportunity to showcase the new platform.