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Centerfire Rifles - Semiautomatic or Gas Operated Centerfire rifles, carbines and other gas operated rifles.

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  #1  
Old 07-19-2019, 10:57 AM
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Default Converting spare AR muzzle brake for Ruger PCC..

I have a spare 556 2 chamber muzzle brake and figured I might as well do something with it. Since PCC and AR15 have same thread, boring it out for 9mm should be possible. I know there will minimal gain on a PCC since there ain't much gas left in a 9mm exiting 16 in barrel. But it would be a fun project. Anyone tried it yet?
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Old 07-19-2019, 11:03 AM
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Before you do that. What is the thread dimensions on the PCC.
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Old 07-19-2019, 11:28 AM
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Quote:
Originally Posted by baih777 View Post
Before you do that. What is the thread dimensions on the PCC.
1/2"x28
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Old 07-19-2019, 11:41 AM
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I used to bore out surefires that were for 556 to 7.62x39 all the time for ak builds
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Old 07-19-2019, 3:09 PM
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My spare comp is made from tool steel..so would I need expensive carbide drill bits? If so, it may be cheaper to just buy a dedicated 9mm comp.
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Old 07-19-2019, 3:12 PM
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I always just used normal drill bits.
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Old 07-21-2019, 9:06 AM
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You can't really rely on a Drill to go thru a hole perfectly concentric to the existing hole. it may or may not happen.

You really need to "single point bore" the hole on a lathe to get it right. You would use a Carbide Boring Bar to do this.

Anything else is just guessing.

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Old 07-21-2019, 10:23 AM
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Seems easier and cheaper to just buy a brake.

Even if you drilled everything perfectly, the 5.56 brake was engineered for a rifle cartridge using 20-25 grains of powder. You want to use it on a pistol cartridge using 5 grains of powder.
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Old 07-21-2019, 2:44 PM
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Quote:
Originally Posted by sigstroker View Post
Seems easier and cheaper to just buy a brake.

Even if you drilled everything perfectly, the 5.56 brake was engineered for a rifle cartridge using 20-25 grains of powder. You want to use it on a pistol cartridge using 5 grains of powder.
I doubt it would do anything useful beyond redirecting the noise and annoying the neighbors..

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Old 07-21-2019, 4:57 PM
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Quote:
Originally Posted by n8vrmind View Post
I have a spare 556 2 chamber muzzle brake and figured I might as well do something with it. Since PCC and AR15 have same thread, boring it out for 9mm should be possible. I know there will minimal gain on a PCC since there ain't much gas left in a 9mm exiting 16 in barrel. But it would be a fun project. Anyone tried it yet?
I have opened up LOTS of 223/5.56 muzzle brakes to clear other diameter bullets.
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Old 07-21-2019, 4:59 PM
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Quote:
Originally Posted by W.R.Buchanan View Post
redirecting the noise and annoying the neighbors..
There is value in that.
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Old 07-21-2019, 7:06 PM
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Quote:
Originally Posted by W.R.Buchanan View Post
I doubt it would do anything useful beyond redirecting the noise and annoying the neighbors..



Randy
Ya..it is largely a cosmetic upgrade. Sorta like RICE (racing inspired cosmetic enhancement) for carbine. Decided I will just wait for 9mm comp to go on sale..
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