Do I really need to get barrels concentrically rethreaded for suppressors?

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[ARCHIVED THREAD] - Do I really need to get barrels concentrically rethreaded for suppressors?

Posted: 8/22/2017 8:35:51 PM EST

I can understand some cheap PSA barrels. What about the barrel on a stock Daniel Defense Mk18 upper? Can In just take off the muzzle device and add a new QD comp? Does it matter if you're using a 556 suppressor vs a .30 suppressor?

Posted: 8/22/2017 8:37:11 PM EST

[#1]

Should be gtg with a DD. Just look through the bbl and check to make sure the suppressor hole appears concentric.

Posted: 8/22/2017 8:40:26 PM EST

[#2]

You're good with any high end brand (Knight's Armament, Noveske, Radians). You're probably good with a Daniel Defense barrel too. Any good rifle silencer (SilencerCo, Knight's, AAC, Surefire) will have a tapered EDM cut bore to minimize the likelihood of a baffle strike from deflection or slightly eccentric muzzle threads.

Posted: 8/22/2017 8:43:29 PM EST

[#3]

If it's a decent barrel it's fine. Still check it. Screw on the suppressor and look down the barrel. The human eye is a pretty good judge, honestly. I've never had a baffle strike and i've shot many thousands of rounds through various suppressors and various guns, and i've never had concentricity checked beyond what my eye is capable of.

Posted: 8/22/2017 8:44:08 PM EST

[#4]

Well a .30 would give you some room for error. Just check it over first.

Posted: 8/22/2017 8:45:26 PM EST

[#5]

My YHM 10.5 works with a can.

Posted: 8/22/2017 8:50:45 PM EST

[#6]

http://www.surefire.com/sf-bore-alignment-rod.html

Posted: 8/22/2017 8:53:57 PM EST

[#7]

I've only used my Form 1 suppressor direct mounted on Palmetto State Armory, Radical Firearms, and DPMS barrels. All .223. The baffles start at 0.265" and are 0.375" at the exit on an 8" long can. Of course I didn't have any of them concentrically rethreaded.

No baffle strikes.

I'll be poor right here, thank you very much.

Posted: 8/22/2017 8:54:24 PM EST

[#8]

Shot suppressed with Colt, Steyr, IWI, FNH, and Kel-Tec without rethreading.

overwhelming likelihood, is that you will be fine.

Posted: 8/22/2017 8:54:40 PM EST

[#9]

Even my Radical barrel lined right up. Just eyeball it.

Posted: 8/22/2017 8:57:53 PM EST

[#10]

Quoted:
I can understand some cheap PSA barrels. What about the barrel on a stock Daniel Defense Mk18 upper? Can In just take off the muzzle device and add a new QD comp? Does it matter if you're using a 556 suppressor vs a .30 suppressor?

View Quote

Of course you realize that the threads on are different between most 556 and .30 cans.

Posted: 8/22/2017 9:00:40 PM EST

[#11]

I would certainly get a PSA or other budget barrel re-threaded.

But then I would never buy a budget barrel in the first place.

Posted: 8/22/2017 9:02:37 PM EST

[#12]

Never had a problem on any of the dozens of guns I've mounted cans to.

Any barrel from a noveske, down to a PSA bargain bin. Take a quick look with it mounted, you'll see if it's not lined up.

Posted: 8/22/2017 9:03:46 PM EST

[#13]

Thousands and thousands of rounds thru PSA freedoms and PTAC, even full auto thru form 1 cans.

Any reasonable manufacturer will have good threads. Don't overthink.

Posted: 8/23/2017 7:37:29 AM EST

[#14]

Quote History

Quoted:
If it's a decent barrel it's fine. Still check it. Screw on the suppressor and look down the barrel. The human eye is a pretty good judge, honestly. I've never had a baffle strike and i've shot many thousands of rounds through various suppressors and various guns, and i've never had concentricity checked beyond what my eye is capable of.

View Quote

This

Posted: 8/23/2017 7:45:11 AM EST

[#15]

I would certainly check it out don't want to mess up a perfectly good suppressor

Posted: 8/23/2017 7:46:25 AM EST

[#16]

Have people had to rethread PSA barrels?

Posted: 8/23/2017 7:47:04 AM EST

[#17]

I've never checked my PSA barrels and have been fine.

Posted: 8/23/2017 7:54:31 AM EST

[#18]

Quote History

Quoted:

Of course you realize that the threads on are different between most 556 and .30 cans.

View Quote

Funny, my SF SOCOM 7.62 works great on my 5.56 rifles.

Posted: 8/23/2017 7:59:40 AM EST

[#19]

Quote History

Quoted:
I would certainly get a PSA or other budget barrel re-threaded.

But then I would never buy a budget barrel in the first place.

View Quote

Dumb.

Dial calipers will get you a pretty close check in about 10 seconds. If that doesn't satisfy you put a pin in the barrel and spin it in a vee block with an indicator on the pin.

Posted: 8/23/2017 8:09:24 AM EST

[#20]

Ive had to have 2 barrels rethreaded

1 was a oly 45acp

The other a colt

always check, you dont need a special rod to do it either

Posted: 8/23/2017 8:12:02 AM EST

[#21]

You can eyeball it by looking down the barrel. its obvious if something is misaligned and needs tweaked.

Posted: 8/23/2017 8:14:45 AM EST

[#22]

My BCM 14.5" SOCOM barrel threads were perfect, and the YHM QD mount only needed to be pinned and welded by ADCO.

Posted: 8/23/2017 8:15:25 AM EST

[#23]

...

Posted: 8/23/2017 8:18:03 AM EST

[#24]

Buy a Suppressor Alignment Rod from Geissele, Surefire or any reputable manufacturer.

Posted: 8/23/2017 8:23:58 AM EST

[#25]

Quote History

Quoted:
Buy a Suppressor Alignment Rod from Geissele, Surefire or any reputable manufacturer.

View Quote

I found that one of my daughter's carbon arrow shafts were the perfect fit to check alignment and another only needed a single thickness of packing tape for a perfect fit.

Posted: 8/23/2017 8:39:33 AM EST

[#26]

Quote History

Quoted:
Ive had to have 2 barrels rethreaded

1 was a oly 45acp

The other a colt

always check, you dont need a special rod to do it either

View Quote

@taylorwso

What is your favorite method for checking?

Posted: 8/23/2017 8:42:32 AM EST

[#27]

After you've confirmed concentricity the other concerns are bullet stability (is the bbl long enough and have enough twist to stabilize the weight of projectile you want to shoot) and the can unscrewing under fire and causing a baffle strike.

Posted: 8/23/2017 10:14:57 AM EST

[#28]

Quote History

Quoted:
@taylorwso
What is your favorite method for checking?

View Quote

shooting it

put on a upper, look down barrel, if you don't see two concentric "rings" at the end, it won't work.

the eye is a hell of a instrument.

I used to use a rod, but you can just look and tell, you only need a rod if you want to measure it.

Posted: 8/23/2017 10:19:51 AM EST

[#29]

I don't check that shit
Honestly though a lot of my barrels are chopped and rethreaded anyways

Posted: 8/23/2017 10:49:53 AM EST

[#30]

My BCM 11.5" barrel was GTG, as was my 1961-vintage TRW barrel on the M1A.

But I did make a visual check before shooting.

Posted: 8/23/2017 10:54:43 AM EST

[#31]

get a dowel/rod that is straight (Check it for straightness with a straight edge) needs to be almost the same diameter of the barrel and fit fairly snugly.

Install the suppressor and insert the rod carefully inspect with a flash light to see if you are getting any contact.

This is a fast and easy check

or this

Quoted:
Buy a Suppressor Alignment Rod from Geissele, Surefire or any reputable manufacturer.

View Quote

Posted: 8/23/2017 11:02:38 AM EST

[#32]

Quote History

Quoted:
You can eyeball it by looking down the barrel. its obvious if something is misaligned and needs tweaked.

View Quote

This. It's easy to see if it's off.

Posted: 8/23/2017 11:06:43 AM EST

[#33]

I've shot HK, Colt, BCM, FN and PSA barrels through my silencers. All were fine, I didn't even think about checking them first although I probably should have.

Posted: 8/23/2017 11:12:35 AM EST

[#34]

ITT everyone's concentricity is fine.

Two forums over "why do I have so much POI shift with my can?!"

Posted: 8/23/2017 11:13:44 AM EST

[#35]

Anything from Ruger and it might not be a bad idea.

They must have hired the monkeys from CAI to thread their weapons.

Posted: 8/23/2017 11:25:33 AM EST

[#36]

Quote History

Quoted:
I would certainly get a PSA or other budget barrel re-threaded.

But then I would never buy a budget barrel in the first place.

View Quote

So my FN CHF chrome lined barrel from PSA is a budget barrel?

Posted: 8/23/2017 11:46:46 AM EST

[#37]

Quote History

Quoted:

So my FN CHF chrome lined barrel from PSA is a budget barrel?

View Quote

I don't know what PSAs specs and tolerances are so I can't say.

Posted: 8/23/2017 11:49:45 AM EST

[#38]

I thought it was just AKs you needed to worry about this?

Posted: 8/23/2017 12:02:35 PM EST

[#39]

I had a baffle strike that required repairs. Now, I am much more careful transferring any suppressor between rifles. The barrel that caused the baffle strike was an 18" heavy barrel from a well known "high quality" barrel maker. The suppressor had worked fine for many years with all other barrels.

Machining issues can happen as humans are involved. I don't get bent out of shape about it, don't demand compensation. Shit happens.

Posted: 8/23/2017 12:11:14 PM EST

[#40]

Quote History

Quoted:

Of course you realize that the threads on are different between most 556 and .30 cans.

View Quote

Doesn't usually matter if they're QD cans.

Posted: 8/23/2017 12:16:10 PM EST

[#41]

Quote History

Quoted:
Dumb.

Dial calipers will get you a pretty close check in about 10 seconds. If that doesn't satisfy you put a pin in the barrel and spin it in a vee block with an indicator on the pin.

View Quote

It would have to be a precision dowel pin with a press fit in the barrel for that to be accurate which would fuck up your bore.

Posted: 8/23/2017 12:25:23 PM EST

[#42]

First can is currently in ATF jail and I've had this same question.

Is it fairly safe to assume that if I've run a 5.56 BattleComp without issue on both rifles for which I plan to use the suppressor, that I'll be OK? Or, is the end of the BattleComp close enough to the muzzle that the barrel could still be off enough to cause a baffle strike further down the suppressor?

Both uppers are Spike's.

Posted: 8/23/2017 6:13:18 PM EST

[#43]

Quote History

Quoted:
So my FN CHF chrome lined barrel from PSA is a budget barrel?

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
I would certainly get a PSA or other budget barrel re-threaded.

But then I would never buy a budget barrel in the first place.

So my FN CHF chrome lined barrel from PSA is a budget barrel?

Generally I would say that PSA intends to be a price leader. As to your specific barrel, you can call it what you want.

Posted: 8/29/2017 6:10:56 PM EST

[#44]

Quote History

Quoted:
It would have to be a precision dowel pin with a press fit in the barrel for that to be accurate which would fuck up your bore.

View Quote View All Quotes

View All Quotes

Quote History

Quoted:

Quoted:
Dumb.

Dial calipers will get you a pretty close check in about 10 seconds. If that doesn't satisfy you put a pin in the barrel and spin it in a vee block with an indicator on the pin.

It would have to be a precision dowel pin with a press fit in the barrel for that to be accurate which would fuck up your bore.

That is simply not true, the pin can be slightly undersized and still do a perfectly good job without harming your bore. Z class gage pins are dirt cheap (McMaster, $3.89/ea), 2" long and available in sizes by the half thousandth. Buy a couple, use the best fit.

A 2" long pin 0.001" undersize and half way in the bore will only describe a 0.003" radius arc at 6" if it's cocked sideways. Stick it in further and the numbers only get better. Think about the way it work, it's basic geometry.

[ARCHIVED THREAD] - Do I really need to get barrels concentrically rethreaded for suppressors?

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