The Lancer LSX Shotgun Extension Tube in the +2 configuration for the Mossberg 590 (Lancer Systems part no. LSX-2X-M) adds two additional rounds of capacity to the factory magazine tube, installing in place of the factory tube cap for a genuine increased-capacity solution for hunting, competition, or home defense. Lancer Systems builds the LSX line from carbon fiber rather than traditional aluminum, giving the tube a smooth-feeding extension that adds considerably less swing weight to the muzzle end of the shotgun. This +2 model measures 6.5″ and includes an extra-long spring that can be cut to the exact length needed during installation, along with a precision-machined aluminum adapter nut for a secure fit. Extension tube clamps are available separately for tubes that extend beyond the end of the barrel.

Key Specifications

• Capacity increase is +2 rounds (based on standard 2-3/4″ shells) over the factory tube.
• Overall added length measures 6.5″, including the extension nut.
• Built from lightweight carbon fiber for less added swing weight than aluminum tubes.
• Includes a precision machined aluminum adapter nut for a secure fit.
• Fitted specifically for the Mossberg 590 shotgun platform.
• Includes an extra-long spring that can be trimmed to the correct length during installation.

Frequently Asked Questions

How much capacity does this tube add? It adds 2 additional rounds (based on standard 2-3/4″ shells) to the factory Mossberg 590 magazine tube.

Is carbon fiber better than aluminum for this application? Yes, carbon fiber construction adds considerably less swing weight to the muzzle end compared to a traditional aluminum extension tube.

Are there state restrictions on extended magazine tubes? Some states apply the same capacity regulations to shotgun magazine tubes as detachable rifle and pistol magazines; check your local laws before purchasing.

Buy the Lancer LSX Mossberg 590 Extension Tube

Add real capacity to your Mossberg 590 without the extra swing weight of an aluminum tube. Order this Lancer Systems tube from our shotgun magazines selection, with fast, insured shipping from our Lubbock, Texas gun shop.