Suppressors Threading a CZ 527 with light/slim contour barrel

[Creature]

This is the rifle I have that I want to thread for use with my YHM QD 5.56 titanium suppressor (12oz).

http://cz-usa.com/products/view/cz-527-american/

It measures .5715in diameter at the muzzle and the barrel is 21.900in long. The barrel tapers to the muzzles diameter and of course is heavier the closer it gets to the receiver. It shoots AWESOME right now with 40gr Vmaxs but is super loud.

My two main concerns with getting the barrel threaded is

1: Will the barrel have enough metal at the muzzle(.5715in) to put a 1/2-28 thread on it? If not how much should I get the barrel cut down to?

2: With the barrel having a lighter contour would I need to worry about hanging a 12 ounce suppressor off the end?

I primarily use this rifle for hunting coyotes so I'm using it without hearing protection. It really rings the hell out of my ears and it would be ideal to use my suppressor. What do you think gents? Should I just leave it alone or try and pursue the threading it for suppression?

 

[bengineer]

Re: Threading a CZ 527 with light/slim contour barrel

Mount the can! Stop shooting without hearing protection. You are making yourself deaf and you can't even hear it.

The barrel can be cut down, which I always recommend unless you are shooting large volumes of slow powder. You won't be disappointed with a 223 and a 16" barrel. This will gain you some diameter, too.

Also, the muzzle can be: 1. threaded too small and adapted back up to the appropriate thread size. OR 2. threaded to the appropriate thread size and a false shoulder can be put on the barrel. The end result of #2 LOOKS like what you see on either the new Micro7 or the HandiRifle in 300BLK from AAC, et al.

If you put your gun in the hands of someone capable, he will get you a good result and you won't have to worry about the process. Everyone always worrys so much about process. Someone should do a Hitler reacts video to that theme.

 

[Creature]

Re: Threading a CZ 527 with light/slim contour barrel

The load I've been using is 27grs of varget to push a 40gr Vmax at 3800fps. It's a pretty slow powder. Wonder how short I should go on the barrel... Maybe i should switch to Benchmark powder.

 

[Creature]

Re: Threading a CZ 527 with light/slim contour barrel

My main concern is hanging a 12oz can off the end of a light contour barrel. Any of you guys know if that will effect the harmonics?

 

[Creature]

Re: Threading a CZ 527 with light/slim contour barrel

Anyone? Surely someone has tried to hang a suppressor of a light weight barrel before... Trying to make a decision and would definitely appreciate the help. Thanks guys!

 

[Creature]

Re: Threading a CZ 527 with light/slim contour barrel

Found out more info. Yhm says that I need at least .620in for the QD brake to shoulder up against. This means I would need to cut my barrel down from about 22in to 17in.

The rifle is super accurate now and I'm kind of hesitant to change it. The other side of me just says, to hell with it, thread it. I would be super happy with it if the accuracy didn't change.

Do you guys think a barrel with a diameter of .620 would be adversely effected by a 12oz suppressor hanging off the end? If anyone had experience with this I would really appreciate the help. Thanks!

 

[Bill Larson]

Re: Threading a CZ 527 with light/slim contour barrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Creature</div><div class="ubbcode-body">My main concern is hanging a 12oz can off the end of a light contour barrel. Any of you guys know if that will effect the harmonics? </div></div>

No way it CANNOT affect harmonics......
sometimes in a good way
sometimes in a bad way
sometimes not at all....
bill larson

 

[RollingThunder51]

Re: Threading a CZ 527 with light/slim contour barrel

C, of course you should thread this barrel.

1. Get to a gunsmith that knows what they are doing. Ask "how do you make sure the can is inline with the barrel?" and listen closely to their answer. Anything other than a "there is only one way to do it, I come off of the centerbore, only an idiot would go off barrel OD" and you walk away.
2. A good smith will tell you if you need to either reduce the barrel to where they think there is enough meat, or, thread the current profile and put in a permanent transition piece, or just get on with threading.
3. You don't care about the harmonics, you care about POI consistency. In other words, if your rifle consistently shoots to a new Point of Impact with the can on, you are good to go.
4. Ears already ringing, damage being done. Get that can on and use plugs too.

Lastly, you need to know that a .17 hornet is not going to like a .223 can. Too much overbore for a hyper round like that. Better? Yes. Impressive suppression? No. That round eeds a dedicated can or MUCH more volume.

 

[Creature]

Re: Threading a CZ 527 with light/slim contour barrel

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: RollingThunder51</div><div class="ubbcode-body">C, of course you should thread this barrel.

1. Get to a gunsmith that knows what they are doing. Ask "how do you make sure the can is inline with the barrel?" and listen closely to their answer. Anything other than a "there is only one way to do it, I come off of the centerbore, only an idiot would go off barrel OD" and you walk away.
2. A good smith will tell you if you need to either reduce the barrel to where they think there is enough meat, or, thread the current profile and put in a permanent transition piece, or just get on with threading.
3. You don't care about the harmonics, you care about POI consistency. In other words, if your rifle consistently shoots to a new Point of Impact with the can on, you are good to go.
4. Ears already ringing, damage being done. Get that can on and use plugs too.

Lastly, you need to know that a .17 hornet is not going to like a .223 can. Too much overbore for a hyper round like that. Better? Yes. Impressive suppression? No. That round eeds a dedicated can or MUCH more volume. </div></div>

The only reference to barrel OD was in regard to needing a certain amount of metal for the break to shoulder up against.

Also, I'm not going to use a .17 hornet at all. The number 17 was the length I was going to have the barrel cut to.

Thanks for the info guys. Thinking I'm just gonna get it threaded. Again, anymore input would be appreciated.

 

[Creature]

Re: Threading a CZ 527 with light/slim contour barrel

I've decided to get it threaded tomorrow. Will post a pic and will make sure to follow up with accuracy report.

Anyone have a recommendation about what type of crown I should have him put on it?

Also, the rifle shoots 40gr max bullets real well with varget powder but it's pretty slow. Should I switch to a lighter powder since I'm cutting the barrel down to 16.5in?

 

[Creature]

got it back today. Real happy with how it looks and feels. Time will tell with how it functions. Will report back.