Brownells Rifle 3/8'' Standard Apertures Peep Black

The Brownells Rifle 3/8'' Standard Apertures Peep sight is a drop-in replacement aperture for shooters who want to upgrade or repair their existing peep sight setup. These black apertures are designed to fit Williams Foolproof, Target Foolproof, and 5D sight systems, making them a straightforward swap for hunters and target shooters maintaining their iron sights. If your current aperture is damaged or worn, or you're simply looking to refresh your sight picture, these apertures give you a fast, affordable way to keep your rifle sighted without replacing the entire rear sight assembly.

Peep sights remain a favorite among traditional hunters and precision shooters alike. Whether you're running iron sights as a primary system or keeping them as a reliable backup to glass, a quality aperture makes a real difference in sight picture clarity and target acquisition speed. The 3/8'' standard shank length ensures compatibility with the three most common Williams sight models, so installation is straightforward if you already have one of those systems on your rifle.

Built to Brownells' standard, these apertures are a no-fuss solution for maintaining or upgrading your peep sight without overcomplicating things. If you're familiar with your current sight system, swapping apertures is one of the quickest and least expensive ways to extend the life of your iron sights setup.

Key Features

• Standard 3/8'' shank length for direct fit on Williams Foolproof, Target Foolproof, and 5D systems
• Black finish blends with most rifle setups
• Drop-in replacement aperture—no gunsmithing required
• Affordable upgrade or repair option for peep sight maintenance

Specifications

Frequently Asked Questions

Will this aperture fit my Williams sight?

Yes, if you have a Williams Foolproof, Target Foolproof, or 5D sight system. The 3/8'' standard shank is the correct length for these three models. If you have a different Williams model or aperture height requirement, verify your current sight model before ordering.

Do I need a gunsmith to install this?

No. This is a drop-in aperture replacement. If you're comfortable removing the old aperture and sliding the new one in, you're all set. Refer to your sight manufacturer's instructions if you're unsure about the removal process.

Is this a complete sight, or just the aperture?

This is the aperture only—the small round component at the rear of your peep sight that you look through. It's a replacement part, not a full sight assembly.

What color options are available?

This aperture comes in black finish.