Mossberg 500/590 Leo Gen Ii Hydraulic Starter Pack 12G/20G

The Mossberg 500/590 LEO Gen II Hydraulic Starter Pack is a modern stock adapter system that transforms your shotgun's ergonomics and handling. Built by Mesa Tactical Products, this adapter replaces your shotgun's factory stock with a component that accepts standard AR-15 collapsible stocks and pistol grips—giving you the modularity and adjustability that law enforcement and tactical operators depend on. If you run an M500 or M590 and want a shorter, faster-handling platform with genuine recoil reduction, this is your solution.

The real advantage here isn't just modularity; it's recoil management. This starter pack includes Mesa Tactical's adapter paired with a KynShot hydraulic recoil buffer, a combination that's earned its reputation as one of the most effective felt-recoil reduction systems available for shotguns. The hydraulic buffer absorbs and dissipates energy rather than simply slowing it, so you recover faster between shots and stay on target when it matters. Whether you're running training drills, live-fire qualification, or field work, less recoil fatigue means better performance.

The starter pack includes the stock adapter and hydraulic recoil buffer plus all necessary installation hardware. You'll need to source your own AR-15 compatible collapsible stock and pistol grip—this gives you the freedom to choose components that fit your preferences and mission. The adapter also accepts optional push-button sling swivels, letting you dial in your carry setup exactly as needed. Compatible with both 12-gauge and 20-gauge Mossberg 500 and 590 shotguns.

Key Features

• AR-15 buffer tube interface—use standard collapsible stocks and pistol grips
• Integrated KynShot hydraulic recoil buffer reduces felt recoil and improves recovery
• Shorter length of pull compared to factory stock for faster weapon handling
• Modular design—swap stocks and grips to match your role or preference
• Optional push-button sling swivel attachment points
• Works with Mossberg 500 and 590 in both 12-gauge and 20-gauge
• Includes all installation hardware

Specifications

Frequently Asked Questions

Will this work on my Mossberg 500 or 590?

Yes. This adapter is designed for Mossberg 500 and 590 shotguns in both 12-gauge and 20-gauge. Verify your model number to confirm compatibility.

Do I need to buy a stock and grip separately?

Yes. The starter pack includes the adapter and hydraulic buffer but not the collapsible stock or pistol grip. You'll need to source AR-15 compatible components separately. This lets you choose the exact setup that works for your mission.

How much does the hydraulic buffer reduce recoil?

The KynShot hydraulic buffer absorbs and dissipates recoil energy, resulting in significantly reduced felt recoil compared to a standard shotgun stock. It's one of the most effective recoil-reduction systems available for the Mossberg platform.

Can I add sling swivels?

Yes. The adapter accepts optional push-button sling swivels, giving you flexibility in how you configure your carry and engagement setup.