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Old February 28, 2018, 04:11 PM   #1
std7mag
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Chamber flags and chamber temps.

I've been in talks with a company that makes chamber flags.
My concern is that after a 20 round string the chamber MAY be hot enough to melt said plastic.

Has anyone checked chamber temp after a string?

What are the competition shooters using?

Thanks.
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Old February 28, 2018, 08:11 PM   #2
PPGMD
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I use Chamberviews as my primary flags. But I have a 6 pack of cheap Tapco flags distributed among my various packs as back ups.

I don't think heat is that big of a deal you are looking at 1-3 shots a second average.
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Old March 1, 2018, 10:51 AM   #3
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i did some reading a bit ago about cooking off of rounds, where the chamber temp is high enough to ignite a round, and this was for AR-15 type rifles, and that temp was right around 350F, and that temp was reached after doing mag dumps of 5 or 6 thirty round magazines.

so unless you are doing that, you should be fine.

if you still aren't sure, get a spare chamber flag you can sacrifice, turn on your oven to 350F, place the flag on a piece of aluminum foil, and place that in the oven for 10 min and see what happens.
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Old March 1, 2018, 11:52 PM   #4
4V50 Gary
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A decent manufacturer will use polymers that can tolerate high temperatures. Knock offs, not so.
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Old March 2, 2018, 01:28 PM   #5
Prndll
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Let your firearm cool off before putting any flag into it.
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Old March 4, 2018, 12:32 PM   #6
RC20
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Not always a choice if a cease fire is called.

You might check the mfg and see what their temp is, silicone rubber will not melt, that is the stuff they use for Kitchen tools.

Nylon will melt, Polymer act different but have not worked with them at breakdown temps so no sure how they do.

Call your mfg and ask them.
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Old March 9, 2018, 11:13 AM   #7
NMC_EXP
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Quote:
Originally Posted by std7mag View Post
I've been in talks with a company that makes chamber flags.
My concern is that after a 20 round string the chamber MAY be hot enough to melt said plastic.

Has anyone checked chamber temp after a string?

What are the competition shooters using?

Thanks.
The flag you see most often at Highpower rifle matches is this one from MTM:

https://www.brownells.com/shooting-a...prod32534.aspx

These matches have rapid fire strings, 10 shots in 60 or 70 seconds. Rules require a chamber flag be inserted as soon as firing is complete. They do not melt or even soften as far as I can tell. Most folks are shooting ARs these days.
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Old March 9, 2018, 11:19 AM   #8
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Plastic and rubber are both polymers.

Plastics are subdivided into two types: thermoplastic and thermoset.

Get a thermoplastic hot enough and it will melt. Common thermoplastics include nylon and polyethylene. Melting temp for the various types vary a lot.

Thermosets may char or burn but will never melt. Common types are phenolics and epoxies.

All types of rubber are thermosets.
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