Jukar lock

[TrapperLou]

Hello all. I have acquired a Jukar 45 cal percussion rifle I was wondering if anyone knew what size nipple should be in it? When I fire a cap it seems the hammer will jump n land back in spent cap. Thinking I have a weak spring. What’s your thoughts? Also just took pic with hammer cocked so one can see the cap. Thanks

 

[Grenadier1758]

The nipple will probably be in metric threads. Since @TrapperLou can remove the nipple, it is a relatively simple process to take the nipple to the local hardware store and use the thread test fixture to measure the thread pitch.

 

[chorizo]

I believe Jukars are M6x1 just like the other Spanish made Traditions and CVA

 

[vintovka]

That may be a dangerous situation and rough on lock. Might be nipple is allowing too much gas to escape on firing?

 

[chorizo]

That may be a dangerous situation and rough on lock. Might be nipple is allowing too much gas to escape on firing?

Likely a worn eroded nipple if the charge isn't too large.

Get a tesco nipple

 

[TrapperLou]

That may be a dangerous situation and rough on lock. Might be nipple is allowing too much gas to escape on firing?

That’s kinda what I’m thinking. I would imagine either the inside diameter of nipple is too big or I have weak spring in lock. Or both

 

[chorizo]

Likely a worn eroded nipple if the charge isn't too large.

Get a tesco nipple

Treso....I always make that mistake. If you can't find them in the normal places, you can almost always find them on EBay at a premium

 

[chorizo]

I zoomed in on your nipple ...that type of nipple will blow back on you every time. Once upon a time, somebody got the bright idea that a bigger hole in the nipple and the side holes would allow for more "fire blast" to make it to the powder......unfortunately, they failed to realize it goes both ways and there is a lot more pressure coming "from" than going "to"

 

[necchi]

what size nipple should be in it?

It's called "hammer blow-back" and as said it's from a worn nipple.
What you need is as @chorizo mentioned, a 6x1metric is what fit's the Jukar. They are commonly available.

 

[russellshaffer]

What is your load? How much powder and are you using a round ball or something else? Also exactly what powder?

 

[TrapperLou]

It's called "hammer blow-back" and as said it's from a worn nipple.
What you need is as @chorizo mentioned, a 6x1metric is what fit's the Jukar. They are commonly available.

Thank you will try that

 

[TrapperLou]

What is your load? How much powder and are you using a round ball or something else? Also exactly what powder?

45 gr 3f patched roundball

 

[flconch53]

45 gr 3f patched roundball

You must have a hole in that nipple you could drive a truck thru. A new nipple should give you better performance all around

 

[hanshi]

Agreed. A new nipple is called for and you can throw that old one away. I experimented with an underhammer at one time. All was copacetic until a certain amount of powder caused hammer blowback. Wasn't the nipple in this case, just the load parameters.

 

[TrapperLou]

Hello all. I have acquired a Jukar 45 cal percussion rifle I was wondering if anyone knew what size nipple should be in it? When I fire a cap it seems the hammer will jump n land back in spent cap. Thinking I have a weak spring. What’s your thoughts? Also just took pic with hammer cocked so one can see the cap. Thanks

UPDATE. Replaced the nipple with new and it solved the issue thanks everyone for the help!