870 Front Sight Help

[xSHEMx]

The front sight on my 870 Express Tactical fell off. Not sure how it was mounted before, there doesn't seem to be any adhesive residue or missing hardware. When I slide the sight back onto the ramp, it feels very loose and falls out if I tip the gun in either direction. Anyone have any advice on the best way to get this sucker back on? Pic below.

[sbsdexp1]

Try some green loctite. This loctite is specific for press fit applications. Appears to have been held on by a pressed dovetail fit before.

At the machine shop I work at, we always apply this green loctite on any press fit components that we assemble. I forget the product number and strength number, but im sure if you go on the Loctite website they will have a user guide.

hope that helps

[ar15barrels]

Try some green loctite. This loctite is specific for press fit applications. Appears to have been held on by a pressed dovetail fit before.

At the machine shop I work at, we always apply this green loctite on any press fit components that we assemble. I forget the product number and strength number

It's Loctite 620

Also known as "sleeve retaining compound".

[hermosabeach]

It
Looks like the assembly is plastic.

You can peen the front sight post to create a compression fit.

Always peen the cheapest part. If you mess it up then you can just buy the new front sight blade.

For a more drastic fix, you could drill through the front sight base and post and then tap it. Screw in an Allen head cap screw

If this is a defensive firearm, time to consider upgrading to a steel design for durability.

[xSHEMx]

Well, the Loctite didn't do anything. I left it for several hours and it hadn't hardened or become sticky in anyway. Not sure what I'm doing wrong, too much Loctite? Not enough? Any other adhesive solutions?

[ar15barrels]

Loctite is anerobic.
It cures though the lack of air.
You can put a drop on your counter and let it sit there and it won't cure.
However, put it somewhere devoid of air amd it will fully cure in 24hrs.
If you can see/touch it, it's not going to cure.

It's also not designed to fill gaps so don't use it in that manner.

If you want a good adhesive, look at blackmax.
It's what they use to glue trijicon front sights on to a shotgun barrel.

[SB1964]

Best advice, take it to Randall.

[wweigle]

111

[wweigle]

If the site is metal then Hermosabeach has suggest and explained a viable method of dealing with dovetail joint looseness. Using a punch to prick punch/peen/raise the metal on the lower dovetail joint surface of the site, so it is a tight fit in the female part of the dovetail. I believe it is the traditional method of fixing your problem that has been used for centuries.