jb weld and heat

[montveil]

I would like to install sights on my NEF Pardner shotgun with a fixed mod choke.
I would like to use JB weld for the job.
The spects on JB weld state that it is good up to 650 degrees F.
I might want to remove the sights== damaged sometime in the future

Question : would heating the barrel to ~700 degrees damage the metal??
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[BADUNAME37]

I am not a metalurgest (cannot even SPELL it), but I would say, No, enough heat from a heat gun to evenly heat up the barrel to turn the epoxy into gum will more than likely not injure the barrel.
I have seen barrels shot so much in such a short time that you could cook a hamburger on the barrel!
THAT IS HOT! Yet, that gun kept working and working just like new!

If someone thinks it would, please put your two cents in here!

 

[dfariswheel]

It should be Okay.
Front sights and external adjustable chokes are routinely brazed on barrels and that takes at least 1100 degrees of heat.
However, the barrel's finish may be ruined.

A possible option is Loctite Black MAX, which is a form of super glue mixed with a black rubbery binder.
This is sold by Brownell's as a bonder for shotgun sights and ribs. Reports say it really holds as long as you do a good job cleaning thee metal of old lube.

http://www.brownells.com/.aspx/pid=6139/Product/BLACK_MAX_ADHESIVE

 

[montveil]

Thanks guys.
I think I will Jb or the black locktight them. The JB will probably be my choice as the fit is not perfect and the filler properties will be an advantage. I'll use a micro torch to remove them if the need comes.

By the way I used "airplane model" general purpose glue to stick on the sights to see if they would be acceptable. Much to my great surprise they held through 5 reduced recoil 12 gauge shots and I actually got a zero.. Granted the sights have a large surface area but who would have believed it. I figured I would get only one shot. The Pardner weighs less than 5 pounds and recoil is significant. Sometimes simple gets the job done.

As a side note I used the Black locktite to repair Bakelite and it has held so far on a coffee maker.

 

[Carl N. Brown]

I "temporarily" installed a Weaver-style side mount for a scope sight using JB Weld years ago, intending to have the receiver drilled and tapped if it worked out OK on trial test. (I clamped the mount to the receiver for 48 hours to cure after taking the inside of the mount and the covered area of the receiver down to bare steel, degreasing, and applying the JB.) The "temporary trial" period is approaching fifteen years now. Anyone with any experience with JB Weld know how long it is supposed to last?


CLOSER TO OPENING POST: I have installed open sights on a shotgun barrels and a .22 rifle using epoxy, and removed them by heating the sights with a candle flame to break the epoxy seal, then smacking the sights with a block of wood. I don't think the temperature to break the seal is enough to harden or soften steel, although it does approach the temperatures I have seen recommended for stress-relieving welds. I would still prefer to get an opinion from someone with more experience than me.

 

[bruzer]

I use JB Weld on lots of stuff with good and bad results. Gas tanks=no leaks, parking meters=no problems, smooth out the welds on a fire hydrant=can't tell where it was broken and welded together after paint, cracked electric motor housing=immediately cracked again. My thoughts on a gun barrel. Any heat would not hurt but the vibration/ muzzle blast might be enough to crack the JB Weld. Good luck,
Mike

 

[montveil]

Can't spend too much on a $100 "tractor gun"

Thanks guys