9 Best Crosman Williams Rear Sight of 2026 For 3/8 Dovetails

1

Williams WGRS-H&R Compact Low Profile Receiver Peep Sight (17778)

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• ARS Mark

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  9.5
• Brand
  Williams Gun Sight Company

Key specs2

Mounting interface

Engineered specifically for Harrington & Richardson receiver contours. The sight base attaches directly to factory-drilled receiver holes rather than grooved airgun dovetails.

Sight style

Low profile receiver peep sight

Pros & cons33

Pros

• Compact low-profile build minimizes snagging on scabbards or gun cases
• Receiver peep design offers a clean sight picture over factory open sights
• Lightweight construction mounts directly to designated H&R receivers

Cons

• Designed for H&R firearms rather than Crosman 3/8-inch airgun breeches
• Lacks click-adjustable micrometer windage and elevation knobs
• Front sight height compatibility must be verified to achieve proper zero

2

Williams Western Precision Fool Proof (FP) Series Micro-Adjust Sight Set

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• ARS Mark

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  9.3
• Brand
  Williams Gun Sight Company

Key specs3

Adjustment mechanism

Equipped with internal micrometer adjustments and positive internal locks to control windage and elevation with precision, eliminating slippage during field recoil.

Included components

• Fool Proof rear peep sight with thumb knobs
• Western Precision skeletonized front globe
• 6-piece metal reticle insert card

Housing material

85,000-pound tensile strength alloy

Pros & cons43

Pros

• Internal micrometer adjustments with positive internal locks provide precise tuning
• High-strength alloy housing provides 85,000-pound tensile strength at just 1.5 ounces
• Includes skeletonized front globe sight with a 6-piece metal reticle insert card
• Thumb knobs allow quick windage and elevation changes without special tools

Cons

• Engineered for CVA muzzleloaders rather than airgun dovetail rails
• Front globe configuration may not mount to Crosman barrel profiles
• Full sight set adds bulk compared to standalone rear peep sights

3

Williams Universal Slugger Fire Sight Set

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  9.2
• Brand
  Williams Gun Sight Company

Key specs2

Sight technology

High-visibility fiber optics

Intended application

Optimized for shotguns used in deer, turkey, and defensive roles, utilizing fiber optics that gather ambient light for faster target acquisition in dim brush.

Pros & cons43

Pros

• High-visibility fiber optics gather ambient light for faster low-light sighting
• CNC machined from high-grade aluminum for rugged field use
• Weighs only 0.1 pounds to keep firearm balance neutral
• Offers integrated windage and elevation adjustments

Cons

• Configured as a shotgun slugger set rather than a Crosman breech mount
• Fiber optic pipes can be vulnerable to impact without protective hoods
• Requires verifying rib or barrel fitment before mounting

4

Wilson Combat Battlesight Rear Sight Serrated Blade Square Notch Colt

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• ARS Mark

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  8.6
• Brand
  Wilson Combat

Key specs2

Blade design

The rear blade features a .135-inch wide partially serrated U-notch that reduces glare in direct sunlight while maintaining crisp sight alignment.

Platform compatibility

2020 Colt Python and Anaconda revolvers only

Pros & cons33

Pros

• Partially serrated U-notch blade cuts glare across bright shooting conditions
• Precise windage and elevation adjustment screws allow exact point of impact zeroing
• Serrated blade notch measures .135 inches wide for rapid sight alignment

Cons

• Machined strictly for 2020 Colt Python and Anaconda revolver dovetails
• Not compatible with Crosman airgun 3/8-inch breech dovetails
• Lacks peep apertures for precision target shooting

5

Magpul MBUS Flip-Up Backup Sights, Black, Rear Sight

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• ARS Mark

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  8.5
• Brand
  Magpul

Key specs1

Deployment mechanism

Spring-loaded folding design allows rapid deployment when backup sighting is required, folding flat to prevent snagging when primary optics are mounted.

Pros & cons33

Pros

• Spring-loaded flip-up mechanism deploys instantly when backup sighting is needed
• Folds down flat to clear overhead optics and low-mount rifle scopes
• Lightweight polymer housing resists impact damage in rough field environments

Cons

• Requires a standard Picatinny rail instead of an airgun 3/8-inch dovetail
• Lacks micrometer target click adjustments for match airgun grouping
• Sight height is designed for AR platforms rather than low airgun breeches

6

Crosman Williams Rear Sight, Notched Blade, Elevation & Windage Adj.,

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• ARS Mark

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  8.4
• Brand
  Crosman

7

Williams Gun Sight Ruger MK II, III or IV “Bull

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  8.4
• Brand
  Williams Gun Sight Company

Key specs2

Adjustment mechanism

Features positive click adjustments for windage and elevation, providing audible and tactile feedback for repeatable zeroing on target.

Firearm fit

• Compatible with Ruger MK II, III, and IV Bull Barrel pistols
• Incompatible with 22/45 Lite variants
• Incompatible with tapered barrel models

Pros & cons43

Pros

• Click adjustment mechanism delivers repeatable windage and elevation tuning
• High-visibility fiber optic Fire Sights speed up target acquisition in varied light
• Machined and assembled in the USA from durable aluminum alloy
• Backed by a lifetime warranty on sights and a 2-year warranty on fiber optics

Cons

• Restricted to Ruger MK bull barrels and incompatible with Crosman airguns
• Will not mount to 22/45 Lite or tapered barrel variants
• Fiber optic elements require ambient light to remain visible

8

UTG Super Slim Flip-up Rear Sight

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• ARS Mark

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  8.3
• Brand
  UTG

Key specs2

Aperture options

Provides dual aiming apertures for varying shooting distances alongside a tool-free windage adjustment knob and posi-lock retention to prevent accidental collapse.

Rail interface

Standard Picatinny rail mounting

Pros & cons43

Pros

• Posi-lock retention design prevents the sight tower from collapsing during recoil
• Tool-free windage adjustment dial allows rapid adjustments at the range
• Dual aiming apertures support fast target acquisition and precision shooting
• Machined from matte black anodized aircraft-grade aluminum at 0.13 pounds

Cons

• Mounts to Picatinny rails and will not clamp to 3/8-inch airgun dovetails
• Rifle-height geometry will sit far too high on factory airgun front posts
• Elevation adjustments require pairing with a matching front sight post

9

Williams WGRS-54 Receiver Peep Sight

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• ARS Mark

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  8.1
• Brand
  Williams

Key specs2

Receiver dovetail fit

• Savage-Anschutz models 54, 64, 141, 141M, 153, and 153S
• Remington model 541S
• Winchester models 310, 320, and 9422

Optical characteristics

The aperture peep collects ambient light naturally to deliver a sharper front post focus downrange compared to standard notch-and-post open sights.

Pros & cons43

Pros

• Clamps to dovetails on Savage-Anschutz, Remington 541S, and Winchester rimfires
• Machined from light aluminum alloy with a total weight of 0.20 pounds
• Aperture peep design delivers superior target clarity over open notches
• Uses natural ambient light without requiring artificial power sources

Cons

• Dovetail clamp is tailored to rimfires and may require fitting on Crosman breeches
• Elevation adjustments rely on sliding lock screws rather than click knobs
• Aperture height may require altering the factory front sight post height

Last update on 2026-10-06 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Which Williams rear sight fits directly onto a Crosman 3/8-inch dovetail?

The Crosman Williams rear sight with a dedicated 3/8 mount clamps directly onto matching grooved receiver rails without drilling or custom modification. This model features an open notched blade with integrated windage and elevation screw adjustments designed specifically for airgun breeches. Many firearm receiver sights look identical externally but feature flat bases meant for drilled and tapped screw holes, so confirming the 3/8-inch clamp specification is critical before mounting.

What is the difference between a notched blade and a receiver peep sight?

A notched blade offers a traditional open rear sight picture with a square or U-shaped cutout, while a receiver peep sight uses an aperture ring that sits closer to your eye. Sights like the Williams WGRS-54 receiver peep sight, machined from light aluminum alloy, offer unmatched open sight visibility at longer distances compared to standard fixed open sights. Choosing between them depends on your preference: notched blades allow rapid alignment for informal plinking, whereas receiver peeps naturally center the front post to tighten precision pellet groups.

Will a Williams receiver sight require a taller front sight post to zero properly?

It depends on your receiver height and the profile of the specific sight base. Low-profile models like the Williams WGRS-H&R compact design sit close to the bore line, but standard receiver sights raise the rear notch higher than factory plastic sights. If the rear sight runs out of downward elevation adjustment during zeroing, verify your barrel's front post height and confirm whether a taller front blade is required to bring your point of impact down.

How do internal locks and micrometer adjustments hold zero under recoil?

Positive internal locks physically secure the adjustment mechanisms so cocking vibration and mechanical shock cannot nudge the sight out of alignment. Precision units in the Williams Fool Proof series combine positive internal locks with internal micrometer adjustments, giving you controlled windage and elevation movement. Built from high-strength alloy with an 85,000-pound tensile strength, these housings prevent flex and keep your adjustments stable shot after shot.

Can firearm-specific sights like the Ruger MK series mount on a Crosman breech?

No, firearm-specific models cannot clamp to a standard airgun rail. Sights like the Williams Gun Sight bull barrel set are engineered specifically for Ruger MK II, III, or IV pistols to replace factory sights in designated mounting cuts, and they will not fit 3/8-inch grooves. If you shoot rimfire pistols as well as airguns, explore the best red dot sight for Ruger Mark handguns to find dedicated mounting solutions for that specific platform.

How do fiber optic elements improve sight picture and target acquisition?

High-visibility fiber optics gather ambient light along the barrel to create bright, distinct aiming points that stand out against dark targets and low-light backdrops. Sight sets featuring Williams Fire Sights enhance contrast, which helps you pick up the front post immediately upon acquiring a target. For shooters who balance multiple sighting setups, seeing how the best iron sights for cowitness with red dot sights align can also provide valuable insight into setting up crisp backup sight pictures.