is there an option with a bigger sight window? i would like a .125" if at all possible?

Yes. The Tech Sight's aperture inserts kit. It has three inserts .042", .062", .082" and the aperture itself is .125" with no insert. $19.95 on Amazon. I just ordered the sight and kit yesterday, the reviews are good.

Does this come with the screw needed to secure the rear sight to the rifle?

mine did not,you use the screw from the stock irons sites

Only asking because it's not specifically listed but will this fit the 5831?

It should fit fine. I have the 5864, which is the tactical in 300 BO. I believe it is the same gun, different barrels. The sights fit fine, the rear does cover the writing a bit on the back of my receiver, but it does fit and function well. I love these sights. Have them on two different pew-pews.

Will this sight fit a 183 series ranch rifle?

NO... It will not but tech sights do make a sight that fits your older 183 series mini. Go to tech sights web site and look for pre -2005 for your mini.. it's the mini200R model.The picture you have here fits the newer minis IF YOU have a 183 series you don't have the half moon scope mounts in the receiver ..hope this helps

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Tech Sight's MINI200 Adjustable Aperture Sight for the Ruger Mini 14 and Ranch Rifle 5800 Series

Product ID: 11156554

Details

Brand
BVYY
Color
Black
Compatible Devices
Rifle
Item Weight
3.04 ounces
Material
Alloy Steel
Model Name
MINI200

🎯Precise elevation & windage clicks

🔧Tool-free easy installation

⚙️All-steel durable build

Description

🎯 Upgrade your aim, own the range with MINI200 precision!

PLUG AND PLAY UPGRADE - Includes all parts for quick, no-fuss installation on Ruger Mini and Ranch rifles post-2005.
SEAMLESS COMPATIBILITY - Fits multiple Ruger 5800 series models and works with TS211 adjusting tool and IRAS inserts.
PRECISION AT YOUR FINGERTIPS - Effortless click adjustments for windage and elevation keep you locked on target.
CUSTOMIZABLE APERTURE OPTIONS - Standard .062 aperture with optional inserts (.042", .086") to tailor your sight picture.
BUILT RUGGED FOR THE LONG HAUL - All-steel construction ensures durability that matches your Ruger Mini 14’s legacy.

The Tech Sight MINI200 Adjustable Aperture Sight is a robust, all-steel rear sight designed for Ruger Mini 14 and Ranch Rifle 5800 series models made after 2005. Featuring easy click adjustments for elevation and windage, a standard .062 aperture with optional inserts, and straightforward installation, it enhances shooting accuracy and customization for tactical and hunting enthusiasts.

Specifications

ASIN	B006KN7ZZO
Brand Name	BVYY
Color	Black
Compatible Devices	Rifle
Customer Reviews	4.6 4.6 out of 5 stars (173)
Item Weight	3.04 ounces
Manufacturer Part Number	MINI200
Material Type	Alloy Steel
Model Name	MINI200
Model Number	MINI200
Mounting Type	Ruger Mount
Number of Items	1
Reticle Type	Aperture
Sport Type	Hunting
Unit Count	1 Count

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