What kind of rings do I have?

[suedehead]

These were given to me. The ones with angled closing (black and silver) are marked "Japan". Otherwise no markings.

Thoughts?

 

[kamlooky]

Bottom left are Millets.
Toss the other two sets in the garbage.
Pull the screws first.

Actually, toss'im awl in the garbage.

 

[Dmay]

Actually, toss'im awl in the garbage.

Sad but true.

 

[DMS1]

+1 for the garbage can. I despise the millets with screws on both sides. 2x the opportunity for something to come loose.

 

[suedehead]

Bottom left are Millets.
Toss the other two sets in the garbage.
Pull the screws first.

Actually, toss'im awl in the garbage.

The made in Japan ones are cr@p too?

 

[savage112]

These were given to me.

There's a reason why they were given to you. They're junk.

 

[cosmic]

The Millets have their purpose. If you have an old sporting rifle that has been d+t'd poorly, the Millets can give you some windage adjustment. Its worth having a set "in stock" specifically for this reason...

 

[tiriaq]

The other two pairs are Bushnells, I think. They can be useful; one can be reversed to give slight lateral adjustment.
Biggest problem I observed with them is that corrosion can get started between the clamping screws and the aluminum. Makes removal just about impossible.

If you are using the opposing screws for windage adjustment, be careful. The scope can be tweaked.
Here is how I've used Millets: adjust the screws on one side the same, then don't touch them. Do the clamping with the opposing screws.