Outlast Development Group Mossberg 990 AfterShock Adapter

Upgrade your Mossberg with the 990 AfterShock Adapter — a purpose-built, USA-made solution from Outlast Development Group that lets you transform your factory shotgun into a fully customizable platform.

This adapter replaces the OEM birdshead grip and opens the door to serious upgrades. It’s machined from billet 6061 aluminum, hard coat anodized for durability, and accepts any standard AR grip. Whether you’re installing a pistol brace or a fixed stock via threaded buffer tube, the AfterShock Adapter has you covered.

Designed to fit all Mossberg 990 variants, the adapter includes receiver mounting hardware and features limited-rotation QD sling sockets on both sides. Built rugged and lean, this is the adapter Mossberg 990 owners have been waiting for.

Mossberg 990 AfterShock Adapter Features:

• Fits all Mossberg 990 variants – replaces factory birdshead grip

• Machined to accept any AR-15 style grip

• Compatible with standard threaded buffer tubes (stock or brace)

• QD sling mount sockets on both sides (limited-rotation)

• Precision machined from billet 6061 aluminum

• Hard coat anodized for extreme durability

• Receiver mounting hardware included

• All NFA rules apply