O/U Chamber Question

TomstoSwans486

Six Pointer
I have a question on this Miroku (Browning) I received from a family member. I'm not too familiar with O/U's and noticed this 20ga has a ring on the 2nd chamber, which will not fit a 20ga shell. Maybe a dumb question, but was is this? And can it be removed? I'd love to be able to use this as designed and use both chambers if possible. TIA

avchamber.jpg
 

Eric Revo

Old Mossy Horns
Contributor
Appears to be a sleeved barrel that should convert to a smaller gauge. Measure from the end of the barrel and see if it doesn't extend several inches into the barrel.
If that's the case it can easily be removed.
BTW...if this is a full length sleeve it could very well be that the barrel was damaged and this brought the damaged barrel back into service. If there's any doubt, take it to a gunsmith and have them look at it.
 
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TomstoSwans486

Six Pointer
I'd measure the lower barrel to see if it is actually 20G first. You may have a dual guage O/U with 20 on top and 410 in the lower.
I think that's exactly it. The safety switches from over barrel to under barrel, it won't fire at the same time. I don't have .410 shells i tried 28ga and too big, so I do think you're right. Thank you. Never seen a gun like this! Pretty cool.
 

shurshot

Ten Pointer
Agree with Bailey, looks like sub gauge tube (.410). It’s removable if so.

Btw I have that exact same gun in 20 ga. Shoots and handles very well and yes, it’s really a Browning Citori when Miroku made them back in the 70’s. Get that gun straightened out and enjoy shooting it at anything!
 

TomstoSwans486

Six Pointer
There appears to be a sub gauge adapter in the lower barrel which will prevent it from chambering a 20 gauge shell. You should be able to remove it by using a tool designed to do so.
Thanks, any idea what the name is? I've been searching google, looked at Briley's website, and can't find anything.
 

TomstoSwans486

Six Pointer
Agree with Bailey, looks like sub gauge tube (.410). It’s removable if so.

Btw I have that exact same gun in 20 ga. Shoots and handles very well and yes, it’s really a Browning Citori when Miroku made them back in the 70’s. Get that gun straightened out and enjoy shooting it at anything!
I'm excited to shoot it, just picked it up yesterday and cleaned it up. Hoping to get out on some snipe this week before the week goes out.
 

shurshot

Ten Pointer
What is yours choked? Mine was fixed mod/full but I had it reamed out to IC/Mod. Shoots a 50/50 pattern which is what I like.
 

TomstoSwans486

Six Pointer
What is yours choked? Mine was fixed mod/full but I had it reamed out to IC/Mod. Shoots a 50/50 pattern which is what I like.
I'm not sure. I'd assume Skeet or IC given my uncle who had it was a big trap shooter. I'm going to put it on some boards this week and excited to use it. I either have to get this sub gauge adapter out or find me some .410 shells!
 

Bailey Boat

Old Mossy Horns
Thanks, any idea what the name is? I've been searching google, looked at Briley's website, and can't find anything.
IF it's a full length tube this tool will remove it. IF it's a chamber insert it won't. We need to see the muzzle end of the barrel to determine if it's a full tube or just an insert.



Reply and attach a CLEAR photo of the muzzle.......
 

shurshot

Ten Pointer
Here’s a picture of my gun’s choke markings. Yours will be in the same place. The + marking is Full, the +- is for Modified. As mentioned I had mine reamed out to IC and Mod. If yours was used for trap shooting, chances it’s was Full over Imp. Mod as Woodmoose noted.

I also included pic of what other symbols represent. IMG_2931.jpegIMG_2932.png
 

DuckyDave

Eight Pointer
Contributor
Cabelas and other places used to sell short length tube's to make subgauge capability, haven't seen the offered for a while.
Agreed, cool gun. Have fun.
 

JONOV

Old Mossy Horns
Just goes to show I know nothing lol
Trap and Skeet are similar only in that they involve clay targets. In skeet you know where the bird is coming from every time and the distance doesn't really exceed 21/23 yards. Trap you stand further off the from the house and you don't know where it's going to throw the bird. A dedicated trapshooting gun is often specialized enough that you aren't likely to use it for much else; typically it will have a raised comb and longer barrels than one typically would carry in the field.

That setup, is more indicative of a skeet gun, which much more closely resemble a gun you'd carry in the woods even for the most serious, highest level competitors. The barrel (sleeve/subgauge adaptors) are more commonly used by skeet shooters, and skeet also has subgauge divisions at their competitions.

I would probably have it looked at by a gunsmith to remove the sleeve.
 

TomstoSwans486

Six Pointer
Trap and Skeet are similar only in that they involve clay targets. In skeet you know where the bird is coming from every time and the distance doesn't really exceed 21/23 yards. Trap you stand further off the from the house and you don't know where it's going to throw the bird. A dedicated trapshooting gun is often specialized enough that you aren't likely to use it for much else; typically it will have a raised comb and longer barrels than one typically would carry in the field.

That setup, is more indicative of a skeet gun, which much more closely resemble a gun you'd carry in the woods even for the most serious, highest level competitors. The barrel (sleeve/subgauge adaptors) are more commonly used by skeet shooters, and skeet also has subgauge divisions at their competitions.

I would probably have it looked at by a gunsmith to remove the sleeve.
It makes sense now. that's great information. He had 3 other O/Us my aunt is still keeping and I know the Beretta 12ga was modified and had a full choke (under) so makes me think that was his trap gun. I will have to take it to a gunsmith, it's cool to have the .410 but also don't plan to skeet shoot or compete and would use it for an upland gun or something fun to shoot around a swamp even in early duck season.
 

wncdeerhunter

Old Mossy Horns
Contributor
Trap and Skeet are similar only in that they involve clay targets. In skeet you know where the bird is coming from every time and the distance doesn't really exceed 21/23 yards. Trap you stand further off the from the house and you don't know where it's going to throw the bird. A dedicated trapshooting gun is often specialized enough that you aren't likely to use it for much else; typically it will have a raised comb and longer barrels than one typically would carry in the field.

That setup, is more indicative of a skeet gun, which much more closely resemble a gun you'd carry in the woods even for the most serious, highest level competitors. The barrel (sleeve/subgauge adaptors) are more commonly used by skeet shooters, and skeet also has subgauge divisions at their competitions.

I would probably have it looked at by a gunsmith to remove the sleeve.
Lots of trap gun dedicated guns have a single barrel also
 
I’m also wondering why they may have sleeved it. Are there further signs of potential misuse or rust? They could have done so to shore up a damaged barrel.
 

7mm-08

Twelve Pointer
Should be able to push the adapter out from the bore. There may be some rotation needed to clear the ejectors once it moves that first inch.
I had a set of 410 adapter sleeves in a 16 ga for a while.
 
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TomstoSwans486

Six Pointer
Tomstoswans, just curious as to what you ever found out/did with your O/U?
They both are Skeet chokes - the bottom is a .410 - and it looks to be a "plug" - and not an entire sleeve in the barrel. Thinking a gunsmith could still remove? Interesting the safety only allows one shot at a time; and can toggle between over or under barrel.
 

TomstoSwans486

Six Pointer
I’m also wondering why they may have sleeved it. Are there further signs of potential misuse or rust? They could have done so to shore up a damaged barrel.
I don't see any, gun was a little rusty - but for a 45 year old gun in great shape. See my comment about the safety allowing which barrel to shoot. Wonder if it was manufactured this way?
 
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