Carlson's 10-Shot Extension Tube for 12 Gauge Stoeger M3000/3500 & P3000/3500

Increase your 12 gauge Stoeger shotgun’s capacity and maintain smooth, reliable feeding with Carlson's 10-Shot Extension Tube. Designed specifically for Stoeger M3000, M3500, P3000, and P3500 models, this precision-engineered extension delivers durable performance, easy installation, and enhanced shooting efficiency for hunters, competitive shooters, and tactical enthusiasts.

Product Description

The Carlson 10-Shot Extension Tube adds extra shell capacity to Stoeger 12 gauge shotguns, allowing longer shooting sessions without reloading. Constructed from CNC-machined aluminum with stainless steel internals and a corrosion-resistant finish, this extension ensures consistent, jam-free feeding and long-term durability. The kit includes all necessary components and installation instructions for safe and simple bolt-on assembly.

Key Features & Benefits

• Maximum Capacity Upgrade — Adds additional rounds to Stoeger M3000, M3500, P3000, and P3500 magazines for extended field or competition use.

• Stoeger-Specific Design — Precision fit for M3000, M3500, P3000, and P3500 models to ensure flawless function.

• Durable Construction — CNC-machined aluminum tube with stainless steel spring and follower ensures reliable performance.

• Reliable Feeding — Optimized follower and spring maintain smooth cycling with 2¾" and 3" 12 gauge shells.

• Corrosion-Resistant Finish — Hard-coat anodized exterior protects against weather and repeated use.

• Tool-Free End Cap Design — Simplifies installation and maintenance in the field.

• Lightweight & Balanced — Minimal added weight preserves shotgun handling, pointability, and carry comfort.

• Complete Kit — Includes extension tube, spring, follower, end cap, installation wrench, and detailed instructions.

Specifications

Brand: Carlson’s
Model: 10-Shot Extension Tube (12 Gauge)
Compatibility: Stoeger M3000, M3500, P3000, P3500
Materials: CNC-machined aluminum, stainless steel spring and follower, anodized finish
Capacity Increase: Adds up to 4 extra rounds (final capacity depends on shell length and choke configuration)
Shell Length Support: 2¾" and 3"
Dimensions: Extension length 4.0"–4.5", outer diameter matched to Stoeger magazine tube
Weight: Approximately 5–7 oz
Included Components: Extension tube, spring, follower, end cap, installation wrench, instructions
Warranty: 1-year limited manufacturer warranty

Why Choose Carlson's 10-Shot Extension Tube

• Extended Shooting Performance — Reduce reload frequency during hunts, upland outings, or competition stages.

• Reliable & Durable — High-quality materials and machining ensure consistent feeding and long-term use.

• Quick Installation — Designed for easy bolt-on assembly with included tools and instructions.

• Maintains Shotgun Handling — Balanced design keeps your Stoeger shotgun agile and comfortable to carry.

Usage & Installation Instructions

1. Verify your Stoeger model (M3000, M3500, P3000, or P3500) is compatible with the extension tube.

2. Unload the shotgun and follow all firearm safety procedures; remove the magazine spring and follower per the user manual.

3. Thread the Carlson extension onto the magazine tube following included instructions; install spring, follower, and end cap.

4. Test with dummy rounds or snap caps to confirm smooth feeding and proper function before live firing.

5. Recheck tightness after initial range use and periodically thereafter. Confirm function with 3" shells per manufacturer recommendations.

Carlson’s 10-Shot Extension Tube enhances 12 gauge Stoeger M3000, M3500, P3000, and P3500 shotguns, providing extra capacity, reliable performance, and improved shooting efficiency for hunters and competitive shooters.