Air Arms S400 & S410 Adaptors for 1/2 UNF Fitting Silencer

S400 S410 Moderator Adapter

Upgrade your air rifle with this precision-machined 10 mm to 1/2" UNF adapter, designed to convert a 10 mm barrel or shroud to the industry-standard 1/2" UNF (12.7 mm) moderator thread. Perfect for shooters who want to fit a wide range of popular silencers, this adapter ensures a secure, perfectly centred fit for optimal noise reduction and improved accuracy.

Precision Engineering
Crafted with tight tolerances, the adapter provides true concentric alignment between the barrel and silencer, preventing clipping and ensuring consistent performance. The internal bore and external thread are cut accurately for smooth installation and reliable use.

Durable & Lightweight
Made from high-quality, corrosion-resistant metal (commonly anodised aluminium or steel), the adapter maintains strength while keeping weight low. Installation is simple—slide it onto your 10 mm barrel and secure it in place (designs vary between friction-fit, screw-fit, or grub-screw retention).

Specifications

• Barrel/Shroud Fit: 10 mm

• Thread Output: 1/2" UNF (12.7 mm major diameter)

• Thread Pitch: 20 TPI (≈1.27 mm pitch)

• Material: High-strength aluminium or steel (varies by maker)

• Finish: Hard-anodised or blackened for corrosion resistance

Features

• Converts 10 mm muzzle to standard 1/2" UNF thread

• Ideal for fitting most common moderators and silencers

• Precision-machined for perfect alignment

• Lightweight, robust, and easy to install

• Enhances noise reduction performance and accessory compatibility