BACKORDER OMEGA Valve Mod. 1 (5.56)

Patent Pending

BACKORDER. Please allow six weeks after ordering before contacting for updates.

Current orders awaiting fulfillment (prior to 9/1/25: I've got them in hand. They are either finished but waiting for your Mod. 2 to come in, or being processed (cut, turned down, tapped, coated). But they are in hand and coming to you very soon!

View data here. This table can serve simply to give you an idea of some potential starting points.

USPS Disclaimer: I am hereby advising you to choose UPS. Do not harass me if USPS is slow!

"Holy shit this feels like cheating." Music to my ears.

The OMEGA Valve is the first tunable gas valve for the Sig Sauer MCX. It is made from 17-4 stainless steel via additive DMLS manufacturing, and is coated in an advanced hexagonal boron nitride coating.

It does three things:

1. Instead of indexing on a ball detent within the gas block, it indexes on the gas valve retaining pin, allowing for four gas positions as opposed to the original two.
2. It utilizes extended gas flow paths to delay entry of the gas into the expansion chamber of the Valve, slowing down the cycling of the rifle.
3. It utilizes Parker Mountain Machine SCAR gas jet screws, allowing the user to vent excess gas out of the front of the OMEGA Valve. Also available are my own Micro Jet Screws to allow even finer tuning of your system!

When dialed in correctly, the OMEGA Valve will transform your experience with the Sig MCX. You will experience a softer recoil impulse, a less severe at-ear sound signature (when shooting with a silencer), and marginally reduced exposure to toxic gas, regardless of what ammunition and silencer you choose to use. Please note that the OMEGA Valve was designed to tune suppressed performance. Satisfactory results can be obtained in the unsuppressed state, but this was never the goal. Simply put: exceedingly under-powered ammunition may not function properly without the use of the silencer.

With your order, you will receive:

• (1) OMEGA Valve Mod. 1
• (1) Solid Set Screw (already installed)
• (1) 2.5mm wrench

This model has been tested to work with the Sig Sauer MCX Virtus, and Spear LT line of 5.56 rifles. It also works to some degree in 7.62x39 barrels, but it was truly optimized for 5.56, and so it is marked "5.56." If you are running a silencer with your 7.62x39, you should be fine.

It has been tested to work in SOME Legacy rifles, likely close to when Sig made the transition to the Virtus era. If you have a Gen. 1 (AKA "Legacy") MCX, I would look at the "Legacy" line of OMEGA Valves. It will not work in the 300BLK rifles. See the FAQ for additional information regarding compatibility and adjustment.

Be advised: not all valves print equally, and some must be sanded and/or turned down to fit into spec and may have a more "polished" finish than others. 

Disclaimer: Sig Sauer® and MCX® are trademarks of Sig Sauer, Inc. J. Bennett Designs, LLC is not affiliated with or endorsed by Sig Sauer, Inc. OMEGA Valve is an independent product compatible with the Sig Sauer® MCX® platform.

We have data available to be viewed here.