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  #1  
Old 06-05-2018, 08:06 PM
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rimfire can on AR15



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Is there a special nut used as a stop on the barrel for the can to rest against?
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Old 06-05-2018, 08:14 PM
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Most suppressors designed for rim fire will not handle the pressures of 5.56/223.

If the male threaded end of the AR barrel is too long, you can use washers, or a nut as a spacer. Just make sure that your suppressor doesn't work loose.
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Old 06-05-2018, 09:30 PM
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Most decent suppressor manufacturers will have a detailed mechanical drawing on how they want people to mount their cans, usually for free on their website. Barrel shoulder is the normal aligning method, but not always. I'm not aware of any manufacturer using a nut to do this as a nut will not have the precision of a machined shoulder or shim and will cause alignment issues.

As dbmjr1 alluded to, putting a rimfire can on a .556/223 AR is a great way to ruin it and make a grenade on the end of your barrel. Waste of a $200 tax stamp and a possible trip to the ER or morgue.
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Old 06-05-2018, 11:59 PM
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I'm using the CMMG 22lr bolt and the problem is the barrel threads are too long.
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Old 06-06-2018, 06:19 PM
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Gemtech and a few others make a spacer nut that takes care of this issue.
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Old 06-06-2018, 06:28 PM
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Thanks a million!
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Old 06-06-2018, 08:46 PM
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Ah, a .22 conversion upper, not an AR-15.

You are after one of these, these will cover enough threads to properly mount.

https://www.store.silencerco.com/pro...iant=221756564
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Old 06-06-2018, 10:06 PM
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Actually it's a Colt M4 with a CMMG 22LR bolt. Ton of fun!!
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Old 06-11-2018, 04:48 PM
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Going out on a limb here as I don't have one nor do I shoot with anyone that does. You might have issues with threading as 99.9% of all 22 suppressor are threaded 1/2-28, while threads in a standard AR upper is 1/2-36, again I know nothing about AR 22 uppers, just passing on information.
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Old 06-11-2018, 11:38 PM
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Standard for ar is 1/228 according to silencer shop and my experiences.

Sent from my SM-J327P using Tapatalk
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Old 06-12-2018, 12:18 AM
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Quote:
Originally Posted by GE-Minigun View Post
Going out on a limb here as I don't have one nor do I shoot with anyone that does. You might have issues with threading as 99.9% of all 22 suppressor are threaded 1/2-28, while threads in a standard AR upper is 1/2-36, again I know nothing about AR 22 uppers, just passing on information.
That's an interesting AR upper you have there at 1/2-36 threading. All of the ones I've worked on have been 1/2-28 with the exception of the guy with the custom kreiger that had a 5/8-24 TPI threaded heavy barrel. The standard is 1/2-28 TPI for 223/5.56, but who knows what custom stuff has been done by different people.

Silencerco thread spec page: https://silencerco.com/product-support/#tab-4
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Old 06-12-2018, 08:58 PM
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Quote:
5/8-24 TPI threaded heavy barrel.
.308?
https://www.silencershop.com/blog/po...read-reference
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Old 06-13-2018, 02:20 AM
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5/8-24 on the custom heavy barrel was not a misquote. He had krieger deliberately thread it oversize for what is typically a .30 thread. This was done in the idea that the less material removed at the muzzle area the better for avoiding mechanical stress and keeping accuracy. It's an option at some of the higher end barrel makers.

This is a different but similar concept from the idea of backboring the muzzle past the point of the threading. Both Anschutz and Kidd do this on their threaded barrels, again in an effort to get the best accuracy.
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Old 06-14-2018, 08:26 PM
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Originally Posted by jpw062 View Post
Standard for ar is 1/228 according to silencer shop and my experiences.

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Crap never mind...9mm AR's are 1/2-36...my bad.
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Old 06-14-2018, 09:37 PM
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Quote:
This was done in the idea that the less material removed at the muzzle area the better for avoiding mechanical stress and keeping accuracy. It's an option at some of the higher end barrel makers.
This had crossed my mind before but I had never researched it.
If the threads are cut to the proper side of the tolerance, it should be a pretty tight fit.
I know benchrest shooters go to an extreme for accuracy, but I would be very surprised if this could net .001 inches if everything went perfectly.
Is one then using an adapter to thread a 1/2X28 can on the end, or is it a custom can? With an adapter and extra threaded connection in the mix, no way it would be more accurate.

If I were forty years in the past knowing what is known now I would probably not select 1/2x28 as the standard AR thread, preferring something larger diameter, but I don't think it really makes much difference in the end, even to top benchrest competitors. I would be more concerned about the fineness of the threads and people damaging them.

OTOH, it doesn't hurt.
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