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Front sight reducing collar, Is there such a thing?

logandiana

Silver $$ Contributor
I have an adjustable front sight with a 0.750 mounting collar. The rifle that I am considering mounting it on has a barrel diameter of 0.600
Is there such a thing as a reducing collar or spacer that will allow this to work? Something similar to those inserts that used to sometimes come with 30mm scope rings to make a 1 inch tube fit.
Thanks
 
Is the barrel straight (untapered) at the muzzle? If so, a bushing would be very simple. If it’s tapered, slightly more difficult, but certainly doable.
 
It’s straight. Do you think I could make a bushing like this? What would I make it from?
Anyone with a lathe should be able to make it easily. I would use aluminum, but other materials would work. If you don’t have anyone handy, let me know, I’ll make it for you.
 
What sight are you using? Could just make a sight base with the appropriate diameter hole for the barrel diameter
 
I did that on a sight base that was .812 and went on a .750 barrel. Just made a tube and slit it so it would clamp down by the sight base. Easy to do.
 
Har the same issue w/bloop tube on a smallbore rifle years ago. 0.750” - 0.600” = 0.150” / 2 = 0.075”.

Cut a strip of aluminum from a pop can long enough to wrap twice around the muzzle tenon then slipped the ‘tube on, tightened the clamping screws.

Worked great. No wobble, no ‘floating’ zero. I think that Al is ~ 0.003” thick.

0.812” on a 0.750” tenon needs 0.0625” gap filler, 0.3125” all’round. Easier to work up a machined bushing I think (than with the .60 to .75 difference needing so much less material) or find some 0.030” aluminum sheet some place you could roll a strip into a bushing out of.
 
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What did you make it from?
I have a couple of offset sights made by Scott Medisha, the front band was .812 and they came with a bushing to use if you had a .750 muzzle.
The bushing was split and made of some sort of plastic or nylon type material.
Worked great.
Marc Mittry
 
A good hardware store will have a selection of shaft/bore reducing sleeves and bushings of various material. 15mm bore, 2mm wall, would probably be almost perfect. Or a slotted 5/8-3/4.

Online macmaster Carr or similar supplier
 
The main thing is the OD and ID have to be reasonably close to the barrel and sight dimensions. As was said, a custom bushing would be great. Simple to make, if you happen to have a lathe handy.

take Doug Beach in post #5 up on his offer.
 
Made mine from a piece of aluminum round stock. Just lined the slot of it with the slot on sight and have to look close to know it's there.
 
Anyone with a lathe should be able to make it easily. I would use aluminum, but other materials would work. If you don’t have anyone handy, let me know, I’ll make it for you.
That's an awesome job sir! You're a hell of a model American!:D
 
thanks to you DOUG,,,we all should follow your example of helping out not only fellow shooters but our fellow man,,,I aplaud you,,,,Roger
 
And thanks to MarkTrew for the Centra products. Finally got this project finished.
 

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