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1/22/2020 12:12:56 PM
Posted: 1/19/2015 9:59:39 PM EST
this photo from the net sums it up

the threads do not go all the say back, the gap is the diameter of the major threads, and when I put a can on the rifle there is a gap. I don't want to have to machine the barrel or the cans if I have to. Can I use a shim? I know washers are bad but what about a wave washer?

Link Posted: 1/19/2015 10:03:11 PM EST
Link Posted: 1/19/2015 10:07:27 PM EST
I had the same problem with my 700 AAC-SD. I used shims.
Link Posted: 1/20/2015 2:39:20 AM EST
Ah, that Remington QC.
Link Posted: 1/20/2015 7:44:11 AM EST
mine is the same way, i cut my form 1 can, so it would shoulder...id say all those guns where spec'd to use a AAC QD mount. early guns shipped with one.
Link Posted: 1/20/2015 8:09:59 AM EST
I'd buy a jam nut for it to shoulder on.
Link Posted: 1/20/2015 8:51:57 AM EST
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Originally Posted By ikickhippies:
Ah, that Remington QC.
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Mine had a giant burr on the crown.
Link Posted: 1/20/2015 8:52:52 AM EST
[Last Edit: 1/20/2015 8:53:30 AM EST by Engineer]
AAC's "special" thread spec for 5/8x24 direct thread doesn't call for a thread relief. I guess they are counting on a counterbore on the thread mount.

Link Posted: 1/20/2015 11:56:43 AM EST
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Originally Posted By ikickhippies:
Ah, that Remington QC.
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Doesn't look like a quality control issue to me
Link Posted: 1/20/2015 1:04:41 PM EST
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Originally Posted By alemonkey:
I had the same problem with my 700 AAC-SD. I used shims.
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What shims? Jam nut?
Link Posted: 1/20/2015 1:14:25 PM EST
My cmmg was the same way. I used a crush washer.
Link Posted: 1/20/2015 2:46:29 PM EST
[Last Edit: 1/20/2015 2:49:04 PM EST by wildearp]
A crush washer is to NEVER be used on a Gemtech can. It is spelled out on their site and in the instructions. I wouldn't use one on any can.

A shim can be used, however, a relief cut is what is missing on those threads. Some suppressors have a slight bevel at the entrance of the threads to ease installation, and to clear this area in the event a relief cut is missing.

If your can doesn't bottom out on the shoulder, or on shims, you will have an end cap strike. This is how I found out about this issue. Luckily mine was very light and I notice my bullets tumbling by the special sound that makes.

Wave washers are a bad idea too.

I have had it happen a few times. I have sent can adapters back to have them cut properly. I have also sent two barrels back.
Link Posted: 1/20/2015 2:50:38 PM EST
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Originally Posted By dayphotog:


What shims? Jam nut?
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Originally Posted By dayphotog:
Originally Posted By alemonkey:
I had the same problem with my 700 AAC-SD. I used shims.


What shims? Jam nut?
Gemtech sells very nice shim kits. I bet the Silencer Store has them in stock too. The 5/8 can be hard to find when you are in a jam. I recently had a Noveske barrel with very long treading. My HVT quickmount would not bottom out with a full shim kit. I needed two.
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