changing a fixed choke to multi ?

[dyosk]

I wonder whether I can pick you collective brains.I have an older miroku fixed chole trap gun 3/4 and full. I dont use it much as I prefer my high rib citori. I was considering trying a higher rib on the miroku but would like a multi choke for the first barrel.

Is it an expensive/difficult job to get the barrel cut with a thread for an invector choke ?

has anybody had this done with successful results ? Would it need to be reproofed ?

thanks

 

[optima]

I wonder whether I can pick you collective brains.I have an older miroku fixed chole trap gun 3/4 and full. I dont use it much as I prefer my high rib citori. I was considering trying a higher rib on the miroku but would like a multi choke for the first barrel.

Is it an expensive/difficult job to get the barrel cut with a thread for an invector choke ?

has anybody had this done with successful results ? Would it need to be reproofed ?

thanks

Nigel teague will do it for you,he did my brothers p gun about £500 ish for both barrels including chokes

 

[JonSkeet2]

As above, Nigel Teague is your man.

It will need reproofing; IIRC it's a criminal offence to resell a gun that is out of proof too.

Cheers,

Jon.

 

[Chris B]

Yes, Nigel Teague is the man, one barrel screw in choke conversion £190 all in, including reproof. Take a look at his website all the prices are on there. He done my DT10 for me excellent job. Only took 3 days.

 

[Mr Potter]

As above, Nigel Teague is your man.

It will need reproofing; IIRC it's a criminal offence to resell a gun that is out of proof too.

Cheers,

Jon.

Jon,

The service from Teague's is all inclusive, his price includes proof testing, you wont get the gun back until it has been done. The service they offer and the costs are all on his website http://www.teaguepre...hokesltd.co.uk/

dyosk,

you won't get invector chokes for your Miroku, I think that's impossible as factory multi-choke guns have swaged ends to the barrels which can't be done retrespectively. Teague puts there own thread in which is unique to your gun, if you wany extra or spare chokes you have to quote your gun's serial number. Don't hesitate, if you have decided that's what you want to do just get it done. I've never heard of a dissatisfied customer and they have been in business for a good number of years.

Mr Potter

 

[JonSkeet2]

Jon,

The service from Teague's is all inclusive, his price includes proof testing, you wont get the gun back until it has been done. The service they offer and the costs are all on his website http://www.teaguepre...hokesltd.co.uk/

Mr Potter

No argument there, was pretty certain it would be re-proofed as part of the service due to Nigel's reputation and professionalism

Was just making the OP aware of the legalities, would I personally shoot a modified gun without a new proof post work? Hell no!!

Cheers,

Jon.

 

[Fuzrat]

+1 for retro Teague, Splindid job on my mk38

 

[dyosk]

thanks very much for all your help, i've just had a look at the teague website. I'll give them a ring on monday.

 

[Fuzrat]

Always wondered why Nigel uses a unique thread/ choke for each gun??? why not just standardize his own chokes

Edit.

Ok scratch that just had a eureka moment. Because he tailors every conversion to the nominal bore size of the gun he is working with and they can all be slightly different. Duuuuuuuuuuurgh *slaphead smiley here*

 

[JonSkeet2]

Always wondered why Nigel uses a unique thread/ choke for each gun??? why not just standardize his own chokes

It won't be a unique thread but an industry standard one that is most suited to the gun and the barrel thickness. You can cut a very fine thread which doesn't go very deep but achieves the mechanical requirements for pressure Or you can cut a coarserdeeper thread that needs to extend less in length but still achieves the same strength and trueness.

I suspect they will ask for the serial number so that they can accurately match the dimensions they bored in the gun to exacting tolerances, we are talking less than .001" or 1 thousandth of an inch so that the replacement choke fits perfectly and doesn't allow gas bypass and a perfect fit. The difference between chokes is literally thousandths of an inch. To give you an idea what that is the outer single skin cardboard from a packet of cigarettes is about 20-30 thou! a cig paper is 3-4 thou.

I may be completely wrong but that's how I remember it from my aerospace engineering apprenticeship.

Jon.

 

[dyosk]

i have just had another look on the site and it poses another question ? why are all barrel choles sizes different by brand, shouldn't a 1/2 chole always be the same dia if they are all firing the same cartridges. does it mean one brands 5/8 is the same as anothers 1/2 ?

thanks

 

[Fuzrat]

Choke is basically a constriction of the shot passing through it. Half, quarter full etc are just handy ways to express it. However with different manufacturers using different nominal bore sizes yes you are right that 1 half could be the same as anothers 3/8.

You will hear some people talking about choke in thou constrictions which are obviously more accurate to measure. Handy chart from briley here http://www.briley.com/2009/chokeconstrictions.html Basically 1/4, or Improved cylinder, choke is constricting your bore by 10 thousanths of an inch.

Nigel marks his by the fraction system but matches the thou to your bore size, which is more precise.

 

[JonSkeet2]

Yet a Beretta SKT choke is .009" which is much closer to 14 at .010" from other manufacturers.

There are soo many variations across manufacturers.

I await one of the top guys to advise but unless your average is 85-90% in whatever discipline just concentrate on shooting it and don't worry about chokes. OK; if you have a trap gun and want to shoot skeet then yes.

Jon.

 

[Fuzrat]

beretta skt will still throw the same pattern as an invector skt as the nominal bore size is smaller on a beretta than the invector so it needs less squeezing. Beretta Optima .733 to Invector plus .741 so they are constricting to the same size hole give or take a micron or 2. (I think, its late and I have had wine :.: )

 

[JonSkeet2]

<GOINGTOSLEEP>

 

[wylye]

I'll put the kettle on I think!

 

[Fuzrat]

<GOINGTOSLEEP>

Glad I could be of service for your insomnia :.: :.: