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Similar, but different. Mine features a more efficient porting design that is essentially milled (not drilled) graduated discharge chambers, and a better more secure locking system. Hence the Patent...

Weights are for unfitted brakes, and approximate only. Varies depending on thread size, and bore size, as well as tapering after fitting to barrel.

Quatromax - 73 grams. Varimax-QC 137grams.
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I have found that fitting this model of brake to previously threaded barrels can be a bit problematic, or just not really do-able.

They ideally need to be indexed to certain orientation like a...

Over the past few weeks I have been flat out trying to get some of my DFM muzzle brakes stock levels up a bit, and this now includes reasonable numbers of the Varimax-QC brakes in 1/2-28 , M14x1.0mm,...

An unfitted Varimax-QC weighs 141grams - that is with the 1/4" minimum bore hole. Obviously gets a little lighter when opening up to 7mm or .30cal clearance.

All stainless steel for durability and...

Update as of January, 2014. This invention has now been granted a Patent by the Intellectual Property Office of New Zealand (IPONZ).

Patent number: NZ 611493

Quite possibly the first...

Some extra pics from recent installation of a Varimax-QC to a customers rifle. External surfaces beadblasted to blend with existing finish on stainless barrel.

Locating/locking pin indexed at 6...

Thanks. Yep, there has been alot of time and effort go into this particular project over the last 12 months or more. Alot of prototypes made, and torture testing!

Actually this version of the...

yes, these prices there are for the brake only. Fitting is additional cost -depends alot on whether the brake has to be indexed or not, what type of rifle, amount of finishing work required, etc.
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Thanks for the comments.

Yes, that is what the results from the tests show. I don't know why, but i suspect that enough gas disturbance/resistance is caused by the brake internals, that it...

This is the ideal muzzlebrake for guys who regularly traverse between bush hunting and open country shooting. Leave the brake on the rifle, simply turn the braking function on or off as required. No...