CZ Bren 2 Gas Regulator Service | Suppressor Port

(7 customer reviews)


SKU: N/A Categories: ,


This is a Gas Regulator Machining Service, not a product. When purchased, we will CNC machine an undersized gas port into the blank/third setting on your factory Bren 2S or 2MS gas regulator (item #11 factory manual). This undersized port will serve as a dedicated suppressor setting; reducing the pressure at which the bolt unlocks and thereby also reducing the bolt velocity and gas blow back into the receiver.

Through extensive testing of all Bren 2S and 2MS models we have developed dedicated port sizes unique to each of the many different caliber and barrel length configurations. To order, simply select your specific Bren 2 configuration(s) from the drop down menu, then checkout as normal through our online store.  After checkout, you will receive an order confirmation via email. Print a hardcopy of this email (order confirmation) and mail it in with your Gas Regulator(s). The CUSTOMER is responsible for shipping TO our facility. HBI pays for return shipping and insurance, it is included in the cost of the service. Once we are in receipt of your Gas Regulator, turn around time is typically 7-10 business days. Expediting options are available upon request.

We include our High Load Piston Spring with each Gas Regulator that we machine. The High Load Spring has two benefits: first the higher rate spring will reduce the bolt velocity on the Factory “1 – Normal” and “2 – Adverse” settings, second the higher rate spring allows us to use a slightly larger diameter port on the “3 -Suppressor” setting to greatly reduce chances of fouling and “gas cutting” sometimes associated with small diameter ports in short length gas systems. It is not required that the High Load spring be used, but we do recommend it.

NOTE: We do not include a high load spring with the 16″ 556 Carbine Service. We have found that the gas system on this model is well balanced with the factory spring. Additionally, do to the high level of precision required for this job we prefer to work only with unmodified factory/OEM regulators. We reserve the right to reject or decline regulators which are not factory or which have been previously modified by other companies, individuals, or gunsmiths.

Additional information


556×45, 762×39

Barrel Length

8", 9", 11", 14", 16"

7 reviews for CZ Bren 2 Gas Regulator Service | Suppressor Port

  1. Anwar jackson (verified owner)

    Just recently used this gas block assembly and spring combo with my Bren2 8″ 5.56, SB2 surefire suppressor and I can tell you it’s worth it. The bolt when shooting definitely feels softer and less turbulent with no ejection issues. I had zero issues with the new port in the gas block assembly. If you are leary or on the fence about this don’t be as it’s well worth it! I’m very impressed and highly recommend to anyone who has a Bren 2 that wants it suppressed.

  2. Dyoung (verified owner)

    Used this service on my 11″ 556 with a Q Trash Panda and standard 55 gr ammo. With the high power spring, the gun failed to lock back on the last round with multiple mags. I changed back to the OEM piston spring and issue resolved. The smaller gas port has lead to a significant reduction in recoil impulse and no gas in the face; it is super smooth.

  3. TSTurner (verified owner)

    I have an 11” 5.56 Bren 2 with Sig SRD556 Suppressor pinned and welded. I did not have any ‘issues’ prior to having the service performed – my intent was to decrease impulse and possible wear and tear on the piston system. Prior to the service, I had ejection at the 3-3:30 position, now it’s at the 2-2:30 and impulse is noticeably decreased. No issues after putting a mag of M193 through it. Service was fast – time from me shipping to it being returned was about a week.

  4. Ryan Davidson (verified owner)

    Definitely worth it. I have an 11” 5.56 and a sandman L. Recoil and gas blowback improved massively. With the new spring, it has trouble cycling Tulammo steel cased, and my binary trigger won’t function with the new spring. But for suppressor use with semi auto only, my bren functions reliably.

  5. Scott Murdock (verified owner)

    I completely recommend this gas regulator service! My 14″ 7.62×39 was one of the weapons plagued with stovepipe issues; bad enough that I could count on at least one or two stovepipes per magazine. The smaller suppressor port completely fixed the factory over-gassing problem. Now I am seeing consistent 3 o’clock ejection patterns and have had zero stovepipes so far. The turnaround time was very fast and I had my regulator back in a little over a week. Even if you are not planning on running your weapon suppressed I highly recommend this service.

  6. Justin Chechuck (verified owner)

    Works perfect.

  7. Jerry england (verified owner)

    14” 7.62×39 runs great! Had it back in a week, Great customer service! Thanks

Add a review

Your email address will not be published. Required fields are marked *