Has anyone used this on a stainless barrel? I read it uses magnets in addition to the O-rings. Wondering if this causes any problems with stainless.

I here people say "It is not PURE stainless" or real stainless is not strong enough. Its a 416 stainless meaning it has carbon in it. It is ferrous. "Real" stainless or 300 series isn't magnetic at all. Gun manufacturers don't use it because it is gummy and does not hold shape as well. Its purpose is better suited for wear resistance on static non bearing surfaces. Remington found this out the hard way on their 1911 pistols.

What is the shortest barrel length that will fit the bore sight into the barrel. An NAA mini-revolver - 1-5/8" bbl? A Berreta Bobcat 2.4".

I have a Beretta 3032 tomcat and that barrel is 2.4" and it certainly does not fit. it extends 7/8 of on inch longer than the barrel. I think it would be safe to say It would be too long for your NAA Mini.

Will it work in the Ruger-57?

Don't see why not. It comes with adapter o ring for most any caliber

Sitelite Mag Laser Boresighter Black Red Silver | Desertcart British Virgin Islands

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Description

🎯 Lock in your shot with laser precision and never miss the moment!

LEVEL UP YOUR AIM - SRL Scope Leveler included to perfectly level crosshairs before boresighting—no guesswork needed.
BUILT TO LAST PERFORM - Durable metal construction in sleek black/red/silver, proudly made in the USA for serious hunters.
BONUS HUNTING INSPIRATION - Free Muley Crazy DVD featuring a record 255" Muley by SiteLite’s own Rich Langner—gear up like a pro.
LASER ACCURACY GUARANTEED - Class IIIa laser with under 5mW output delivers pinpoint boresighting with lifetime warranty confidence.
PRECISION ACROSS CALIBERS - Universal fit from .22 to .50 caliber and 12/20 gauge shotguns ensures flawless alignment every time.

The SiteLiteMag Laser Boresighter is a versatile, metal-constructed boresighting tool compatible with calibers from .22 to .50 and 12/20 gauge shotguns. Featuring a Class IIIa laser with less than 5mW output and an included SRL Scope Leveler, it guarantees superior accuracy backed by a lifetime warranty. Made in the USA, it also comes with a bonus hunting DVD for added inspiration.

Specifications

Item Package Dimensions L x W x H	10 x 6.4 x 2.4 inches
Package Weight	0.41 Kilograms
Item Dimensions LxWxH	10 x 6.5 x 2 inches
Item Weight	14.4 Ounces
Brand Name	SiteLite
Country of Origin	United States
Color	Black/Red/Silver
Material	Metal
Suggested Users	unisex-adult
Manufacturer	Site Lite
Part Number	18001
Style	Boresighter
Sport Type	Hunting

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