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Stuck suppressor

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supertool73 View Drop Down
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    Posted: December/18/2018 at 09:38
So the other night I pulled by SBR out of my safe and was going to take my Thunderbeast Ultra 7 off of it.  I went to twist it off and it was so tight I could not.  I took it and put it in my vice and it was so tight it would not budge.  I was kind of stumped why it was so tight.  I had put grease on it right before I put it on and I hadn't even shot it since.

As I got thinking about it I realized what might have happened.  For thanksgiving we went to Bryce Canyon for 4 days.  I left the rifle locked up in my SUV the whole time with the suppressor attached.  It was quite cold, getting down to the teens and 20s at night and just the mid 30s during the day.  WHen we got home I bet when I took it out I reached out and made sure it was snug on the attachment as I always do as I don't want it coming loose.  I then stuck it in my safe and it warmed up to the 70 degree it is in my safe.  The suppressor attachment has a conical shoulder so they fit super snug and tight for repeatability.  So the metal likely expanded and on that shoulder it got super tight. 

So I stuck the whole upper in my freezer for 2 hours grabbed a hold of that suppressor and it was still freaking tight, but it came off.  So my lesson learned.  If you use your suppressor in cold weather, take that bugger off before you bring it in the house.  Big smile
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mike650 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mike650 Quote  Post ReplyReply Direct Link To This Post Posted: December/18/2018 at 09:44
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RifleDude View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RifleDude Quote  Post ReplyReply Direct Link To This Post Posted: December/18/2018 at 09:56
 Yeah, mating conical surfaces that are in firm contact can sometimes get stuck together even when kept at a constant room temp. The longer the taper (smaller included angle), the more tendency to stick, per the principle of locking tapers. Large temp swings after torqueing together can certainly make separation more difficult as you saw. Grease helps, but doesn't always prevent difficult separations. If one or both of the adapter and/or suppressor body is made of Titanium or Inconel alloys, the problem is even worse, because those materials are very prone to sticking. I have a Sig SRD762QD Titanium version with quick detach connection and mating conical faces, and I've had difficulty removing it several times even during warm weather and the use of grease.
Ted


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supertool73 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote supertool73 Quote  Post ReplyReply Direct Link To This Post Posted: December/18/2018 at 10:00
Ahh, the Thunderbeast it Titanium as well.  Good to know, thanks Ted.
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tahqua View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote tahqua Quote  Post ReplyReply Direct Link To This Post Posted: December/18/2018 at 10:06
Iconel, that's a blast from the past. It is the most difficult material I have ever machined. Many years back I made a muzzle brake for a friends McMillan .50 BMG. Turning the outside, drilling the bore and inside turning were a chore. But, the inside thread was very hard to do. At least putting in the vents on the EDM was easy.
I don't think he ever had to take it off, though.
Doug
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Scrumbag View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Scrumbag Quote  Post ReplyReply Direct Link To This Post Posted: December/19/2018 at 03:37
Lots of gunsmiths' time in the UK is taken up getting suppressors off the end of barrels after being put back in the cabinet still on the rifle...

Keep it off would be my advice...

Scrummy
Was sure I had a point when I started this post...
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