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

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Sold byAmazon French PolynesiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

LEVEL UP YOUR AIM - Includes the SRL Scope Leveler to perfectly align your crosshairs before boresighting—because precision is non-negotiable.
BUILT TO LAST A LIFETIME - Backed by a lifetime warranty, this rugged metal boresighter is engineered for enduring reliability in the field.
BONUS HUNTING INSPIRATION - Comes with a free Muley Crazy DVD featuring a massive 255" mule deer—fuel your passion with legendary hunts.
LASER ACCURACY YOU CAN TRUST - Class IIIa laser with under 5mW output ensures pinpoint boresighting without compromising safety or performance.
PRECISION ACROSS ALL CALIBERS - Seamlessly compatible with everything from .22 to .50 caliber rifles and 12 & 20 gauge shotguns—one tool to rule your arsenal.

The SiteLite Mag Laser Boresighter is a durable, metal-constructed precision tool designed for hunters and shooters. Compatible with calibers from .22 to .50 and 12/20 gauge shotguns, it features a Class IIIa laser with less than 5mW output for safe, accurate boresighting. Included is the SRL Scope Leveler for perfect crosshair alignment and a lifetime warranty ensuring long-term reliability. Bonus content includes a hunting DVD showcasing a record mule deer, making it a must-have for serious marksmen.

Specifications

ASIN	B001NZLJA6
Best Sellers Rank	#181,284 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #160 in Hunting Boresighters
Brand Name	SiteLite
Color	Black/Red/Silver
Country of Origin	United States
Customer Reviews	4.5 4.5 out of 5 stars (2,077)
Date First Available	July 30, 2011
Item Dimensions LxWxH	10 x 6.5 x 2 inches
Item Package Dimensions L x W x H	10 x 6.4 x 2.4 inches
Item Weight	14.4 Ounces
Manufacturer	Site Lite
Material	Metal
Package Weight	0.41 Kilograms
Part Number	18001
Sport Type	Hunting
Style	Boresighter
Suggested Users	unisex-adult

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