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Military Firearm Restoration Corner

Chapman Safety


ken98k

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I spent most of yesterday working on a Chapman side swing safety. It is very difficult to put in the safe position. There doesn't seem to be any camming surfaces like Buehler or Dayton safeties have.

Also the slitting saw arbor that came with the kit was not true so my 1/8" cut came out a little over sized, so this is definitely an experimental model. I ordered some new tooling last night to remedy that problem. I also ordered a Wisner wing for the next go-round.

Any tips or suggestions?

 

Kenny

 

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FYI the PME wing you ordered uses a different hole location. I like them better than the chapman's. As for the hard engaging, you have to fit your cocking piece to the assembly or the pivot hole wasn't located properly. Are you using an installation jig, if so are you using the right shim?

-Don

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FYI the PME wing you ordered uses a different hole location. I like them better than the chapman's. As for the hard engaging, you have to fit your cocking piece to the assembly or the pivot hole wasn't located properly. Are you using an installation jig, if so are you using the right shim?

-Don

 

I was using the Chapman jig.

Shims? I must have missed something somewhere!

 

safety002.jpg

safety001.jpg

safety012.jpg

safety011.jpg

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I'll mic out the shim you need for the pme wings to work. How far back is the cocking piece being pulled off the sear by the safety? If that is not excessive all you should need to do is stone down the cocking piece edge . I also would lightly break the edge on the safety before you harden it. The pme's are alot easier, they pretty much drop in after the mill cuts.

-Don

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  • 1 month later...

I did a Wisner (PME) safety today. Definately easier than the Chapman.

The most difficult part was making a shim so I could use the Chapman fixture. I used an aluminum washer that sarted out being .060 think and then I filed it down a little at a time until I got everything lined up.

After machining and assembly it worked first time.

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I did a Wisner (PME) safety today. Definately easier than the Chapman.

The most difficult part was making a shim so I could use the Chapman fixture. I used an aluminum washer that sarted out being .060 think and then I filed it down a little at a time until I got everything lined up.

After machining and assembly it worked first time.

 

Great, that's how it's supposed to work out, that's why I like the wisner's kit. They are pretty much drop it once the machining is done. Glad it worked out. I planned on making a new lock down bolt to eliminate the shim, but I never got around to it.

-Don

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Are most of the aftermarket safety's in this style 2 position?

 

Is it a fire/bolt open or safe/bolt locked setup?

 

lc aka IZH27

Both Wisners (pme) and Chapman's are 2 position, they can be set up either way to lock the bolt on safe or not depending on how you fit the plunger.

-Don

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Are most of the aftermarket safety's in this style 2 position?

 

Is it a fire/bolt open or safe/bolt locked setup?

 

lc aka IZH27

 

The 2 I've done were 2 position.

1. safety off - bolt can be opened.

2. saftey on - bolt is locked.

 

It may be possible to modify these so you can operate the bolt with safety on but I haven't looked into that.

 

3 position safties are availible from a least two manufacturers. Those involve replacing the whole bolt shroud and cost about 5 times what I paid for mine.

 

Kenny

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The 2 I've done were 2 position.

1. safety off - bolt can be opened.

2. saftey on - bolt is locked.

 

It may be possible to modify these so you can operate the bolt with safety on but I haven't looked into that.

 

3 position safties are availible from a least two manufacturers. Those involve replacing the whole bolt shroud and cost about 5 times what I paid for mine.

 

Kenny

 

All you do is cut the plunger down until it doesn't lock the bolt if you want to be able to open the action with the safety on.

-Don

 

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All you do is cut the plunger down until it doesn't lock the bolt if you want to be able to open the action with the safety on.

-Don

 

That's what I was thinking, shorten the forward edge, just has not been an issue for me.

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Don,

I'm thinking that this feature would be nice for those customs that I'm considering.

 

I like the bolt locking since I've had trouble with the bolt lifting when hunting in tighter cover.

 

Thanks for the insight fellas!

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I've been considering one of these but could'nt figure out which one. So what I'm getting from this thread is the PME is the better of the two?

 

I like them better, because there are less steps involved installing one. The chapman wing needs to be fit and then hardened, where the wisner's kit is pretty much a drop in after the shroud is machined. They do cost more though.

-Don

 

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