Description
The Williams WGRS-336 is one of the most popular ways to bring a classic Marlin lever gun into modern accuracy without touching a scope. It's a compact, top-mounted receiver peep that replaces the traditional semi-buckhorn rear sight, moving your aiming aperture back closer to your eye. That longer sight radius and the natural way a peep lets you center the front bead means a cleaner, quicker picture on target and tighter groups downrange.
Built Tough and Light on the WGRS-336
The body is machined from an aluminum alloy Williams describes as stronger than many steels, so it stays light and rustproof while taking the beating a hunting rifle sees. It's fully adjustable for windage and elevation with positive locks that hold your zero once it's dialed in. The sight ships with the standard 3/8-inch outside diameter aperture with a .093 inch peep opening, and the aperture threads out if you ever want to open it up for low-light or run a hunting-sized ring.
Fitting the WGRS-336 to Your Marlin
Most installs are straightforward and don't require a gunsmith. The Marlin 336 receiver already has filler screws in the tapped holes on top, so you pull the rear pair, set the WGRS base down, and thread in the screws that come with the sight. This same sight is also commonly used on the Marlin 1894 and 1895 platforms, though on some of those the base can sit a bit rearward. One thing worth knowing going in: because a peep raises your line of sight, you'll often need a taller front sight or a front FireSight to get a proper zero, especially on guns with a barrel-dovetail front rather than a ramped one.
This is a proven, no-nonsense upgrade for anyone who shoots iron sights and wants to see and hit better. It's a favorite with brush hunters, cowboy shooters, and folks whose eyes just don't love a shallow buckhorn notch anymore.
Key Specifications
- Manufacturer: Williams Gun Sight
- Model: WGRS-336
- Manufacturer Part Number: 70200
- UPC: 053506702008
- Sight Type: Receiver Peep (Aperture) Rear Sight
- Color: Black
- Material: Aircraft-grade aluminum alloy
- Adjustments: Windage and elevation with positive locks
- Aperture: 3/8 in. outside diameter, .093 in. peep, long shank
- Fits: Marlin 336, 1894, 1895
- Mounting: Uses existing tapped receiver holes, no drilling required in most cases
- Profile: Compact, low profile
What’s Included
- Williams WGRS-336 receiver peep sight
- One standard 3/8 in. x .093 in. long shank aperture
- Mounting screws
Frequently Asked Questions
Will the WGRS-336 fit my Marlin 336 without a gunsmith?
In most cases, yes. The Marlin 336 comes with filler screws in the tapped scope-base holes on top of the receiver, so you remove the rear pair and mount the WGRS base using the screws included with the sight. It's a simple hand-tool job for most people, and no drilling or tapping is typically needed.
Do I need a taller front sight when I install this peep?
Often, yes. Moving to a receiver peep raises your line of sight, which usually means your rifle will shoot high with the factory front bead. Many owners pair the WGRS-336 with a taller Williams FireSight or an aftermarket front sight to bring the point of impact down to zero, especially on guns with a barrel-dovetail front instead of a ramped one.
Does the WGRS-336 work on a Marlin 1894 or 1895?
It's commonly used on both. Williams lists this sight as compatible with the 336, 1894, and 1895 since they share a similar receiver top. Keep in mind that on some 1894 models the base can sit a little toward the rear of the receiver depending on the hole spacing.
Can I change the aperture size on this sight?
Yes. It ships with the standard 3/8-inch outside diameter aperture with a .093-inch peep, and that disk threads out. You can swap in a larger hunting aperture for faster target acquisition in low light or a smaller one for more precise target work.





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