Question about 3/8ths dovetail on gpr

[Cody2306]

Ok so I haven't got to take my new to me lyman great plains rifle to range yet but I will Monday. But my question is if I wanted to change my rear sight to an adjustable rear sight like the elevated ones. They mostly seem to be 3/8ths . But lyman has the great plains at .340" will the 3/8th dove tail sights work on the gpr?

 

[The Crisco Kid]

3/8" = .375. That won't fit into a .340 hole. It's easy enough to enlarge the dovetail to fit the sight. That is if you know how. If you haven't done it before it's best to take it to someone who has.

CK

 

[Cody2306]

Thanks. Do yall recommend any sight for the rear on theyman great plains. Anybody tried the aml 16 sight?

 

[Nameless Hunter]

Marbles makes an adjustable sight that fits a Lyman.

 

[Cody2306]

Nameless hunter do you happen to have a model number on that site by marbles?

 

[Nameless Hunter]

Nameless hunter do you happen to have a model number on that site by marbles?

They have an open sight and a Bullseye "peep" sight. Look for the metric version.

 

[Walkingeagle]

Pretty sure I did my filing on the sight portion (male part) of the dovetail when I replaced the factory rear. Can’t rightfully disrember though???
Walk

 

[Cody2306]

So you were able to get the 3/8ths to fit? With some filing to the sight

 

[Nameless Hunter]

Pretty sure I did my filing on the sight portion (male part) of the dovetail when I replaced the factory rear. Can’t rightfully disrember though???
Walk

Now that you mention it, I filed a bit off the bottom of my Marbles Bullseye sight (the dovetail was too tall for the barrel cutout anyway). At some point it fit the cutout in my GPR.

 

[Walkingeagle]

So you were able to get the 3/8ths to fit? With some filing to the sight

Ya but had to do some careful filing to get it to work. As you file the bottom, the dovetail gets narrower.
Walk

 

[yonderin]

The couple of times I've fitted a new sight, I set it up to file the sight base. Figured if I messed it up, could get a new sight easier and cheaper than barrel work (or replacement).

 

[andy52]

I'm just finishing up a GPR kit and this is the sight I used, it didn't fit either so I filed the base rather than the barrel.

 

[Nameless Hunter]

I replaced the "primitive" fixed sight on my GPR with this.
https://www.midwayusa.com/product/1828132532
I ended up press fitting a small SS tube (from McMaster Carr) in the middle to reduce the opening.
Not as good as a true peep, but improved my group size.

 

[Zonie]

An old rule that still holds true today, "Remove the material on the least expensive part."
In the case of fitting a sight dovetail, always file the sight's dovetail down to fit the barrel. Never file the barrels dovetail larger to fit the sight.

 

[Cody2306]

Thanks ended up ordering the same hawken sight as Andy. Not 100% sure if I'm going to be filing the very bottom of site base or the bottom corners. But I'm sure I can figure it out. Thanks for yalls help