STI rear sight roll pin walking out

[bababoris]

The roll pin on my sight comes out about quarter of an inch after each stage.  I have been pushing it after i finish but i am afraid I am going to lose it one of these days.  Anything I can to to make sure it stays in?  TIA

[jwhittin]

I had the same problem. I replaced it.  You could try to set it with a center punch enough to hold it or try loctite. 

[CMV]

Remove it, put a slight bend in it and put it back. 

[bababoris]

Thanks guys I’ll give that bend idea a try

[caspian guy]

Measure the pin. Get a piece of music/spring wire of the right diameter from brownells.  Cut it to length plus a bit.  Stick it through and peen both ends to hold it in.

Edited May 29, 2022 by caspian guy

[davsco]

get the pin most of the way out and squirt a little blue loctite in there.

[konkapot]

I went through a lot of this back in the day. There are old posts on this topic. 

 

I don't know about bending that pin; they've got a cut in the middle that prevents them from walking out. Seems like bending it would break it. 

 

Loctite works for a little while. 

 

Someone took a decapping pin and put it in there. Another buddy took a nail (carpenter's?) of some type and put it in there. 

 

I switched from Bo-Mar to a different brand; the other brand had "better" pins that that didn't break. I think the other brand was Champion. 

 

I or my smith would stake them in; it was still broken in there but it wasn't coming out. I got so fed up with all the above that for a while all my limited guns had fixed rear sights. 

[ltdmstr]

Best bet is to use solid rod and either cut a little short so you can stake both ends, or leave a little long and peen the ends.  Stainless TiG filler rod would probably work well if you can match the correct size.

[RePete]

I just tapped it back in and took an automatic center punch and staked both ends.  I did this in 2008 and it hasn't walked since.

[oddjob]

My pin broke at a match.  Emergency thought process kicked in and I used a paper clip.  It has lasted longer than the original pin.

[yigal]

On 5/29/2022 at 6:28 PM, bababoris said:

The roll pin on my sight comes out about quarter of an inch after each stage.  I have been pushing it after i finish but i am afraid I am going to lose it one of these days.  Anything I can to to make sure it stays in?  TIA

Because of your post this problem started with my gun too. 
Full 2mm steel pin broken in 2 places a third time .This  gun  with 15k and i use shock buffer.

[bababoris]

2 hours ago, yigal said:

Because of your post this problem started with my gun too. 
Full 2mm steel pin broken in 2 places a third time .This  gun  with 15k and i use shock buffer.

Sorry to hear it.  I am going to try lock tite first and see how that works out.

[yigal]

1 hour ago, bababoris said:

Sorry to hear it.  I am going to try lock tite first and see how that works out.

my was with lock tite  and it works.