Dlask slant brake on a long barrel 858

[Sardaukar]

I'm considering getting a Dlask slant brake for my (near future) non-res CZ858. Because it looks cool. I fully assume it.

Now I remember seeing a video with a slant brake that was overcompensating and IIRC it was on some form of VZ58. Can anybody give me some feedback on the performance of the Dlask brake on the non-res long barrel 858?

 

[AK]

It's the long barrel where the slant brake overcompensates. You would not like it. I do dig the look also and have been considering one for my restricted model, but would like to hear feedback from someone who's done the same first.

 

[survivalofthefittest]

I'll be putting one on my 11.5" CSA carbine if the czechs ever figure out their business, i saw the video too and i thought with the shorter barrel on the CSA it shouldn't overcompensate, it should work out perfectly, i would also appreciate feedback

 

[olansky]

i was thinking of putting one on my fsn but i dont think id like the over compensation

 

[supernova]

I'm wondering if by either shortening or reducing the slant's angle you could fine tune it to your gun/load to shoot flat. For 25 bucks I think its worth a try.

 

[Sardaukar]

That's what I am considering, but it means I won't get it coated with the rifle. Thanks for the input guys.

 

[supernova]

Let us know how it turns out, I just may add one to my rifle

 

[PerversPépère]

I guess that a slant compensator can be tuned to give just the right amount of downward push.
I would begin with a very small hole at the center of the working surface and going at it gradually from the underside with a multi-flute tapered reamer. Ideal hole diameter to be reached by trial.
Reason for going from the underside? that small outward taper will create a venturi effect to a certain extent. This could help with the gas flow and require a smaller hole in the compensator.
PP.

 

[supernova]

very good idea PP. My 2 thoughts were A. take a file to the range and slowly increase the downward angle of the slant to reduce the amount of gas expelled upward or B. make a tape line maybe 1/16" from the end and file it off, test firing after each increment. I just might have to pick up a couple and try it out

 

[Clobbersauras]

I would begin with a very small hole at the center of the working surface and going at it gradually from the underside with a multi-flute tapered reamer.

Yeesh, I wouldn't do that.

I think supernova has a better idea but I think he will have inconsistent results with his tests.

I'll see if I can look at mine later tonight and think about it a bit.

 

[supernova]

Clobbersaurus, where do you feel the inconsistency would come from? I'm interested to hear your thoughts on all this

 

[AK]

So no one has put one on a 15.5" barrelled CZ858? Does it overcompensate on the restricted ("regular") model or not?

 

[Clobbersauras]

I hesitate to post this because my opinions could be wrong. It's also a possibility that the creator of the AKM style brake could come on here and embarrass me with my childish conclusions.

Anyway, I've tried the AKM brake on both a 12 inch and 18 inch rifle and on both it's compensating effect was vigorous. The one I have is actually different than the one pictured on the Dlask web site. It has a band milled around the midpoint of the device.

At first glance, the AKM brake looks simple, but IMO it's not. I believe a lot of thought went into it and it's actually very elegant in it's design. I've found this to be the case with the Dlask A6 as well. If you know what you are looking at (and I'm not saying that I do), there are actually some very subtle features that you don't see in other designs. They didn't just take some round bar stock and cut some random baffles in them. Someone spent a lot of time on these and took great care to do things right.

But back to the AKM brake. It you look at the brake top down you see a stepped expansion chamber, open at the top, and leading to a grove for the bullet to pass through. Surrounding that is the "slant" potion of the brake. This area is not just cut with flat edges but those edges are concave in nature, I assume to increase surface area and catch more gas.

I believe the expansion chamber step actually provides some small braking effect as the step would act like a small baffle. The step would also push a large portion of the escaping gas upwards at an angle. Since expanding gas tries to go in all directions , the concave surfaces on the "slant" portion catch some of the expanding gas and provide more compensating effect.

Cutting the device back from the front would start messing with the bullet path grove and the other concave surfaces. If I were you supernova, if you tried cutting the device back, I'd carefully watch how these changes affected accuracy. If you went too far, you would mess with the expansion chamber and step, which would really mess up the function of the device.

If I wanted to mess with it, I'd probably try to turn down the outside diameter of the front portion of the brake ahead of the band. This would take surface area away from the concave sides of the slant cut. Which may help limit the compensating effect. If that didn't work, the other thing I would try would be the increase the size of the expansion chamber and slightly reduce the angle of the step. But that would be much more complicated.

It should be noted that the original AKM brake was clocked to the right a bit to prevent muzzle climb. I never tried doing this with the Dlask one.

I'll be watching this thread carefully as I'm very interested in the results.

 

[survivalofthefittest]

you're right the original akm brake did have abit of a 1 o'clock position, whereas the dlask sits straight..

 

[supernova]

thats exactly the kind of info I was hoping for Clobb! I did notice the concave surface area of the slant, that got me thinking about other means like shortening. I dont have one in hand to look at close up so thank you for posting all that. I wonder what the reason for clocking the original was? I also notice the original seems to have the slant sitting alot lower across bore centerline. CNC Warrior makes that style in a right hand VZ thread that I'll probably be trying as well.

 

[Clobbersauras]

wonder what the reason for clocking the original was?

I believe the AK climbs up and to the right under recoil, especially when firing full auto (never fired the real McCoy so I could be wrong). Clocking the brake slightly to the right would force propellant gas upward right, forcing the muzzle downward left, and help to counter the direction of the muzzle climb.