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Beretta USA MobilChoke 20 Gauge Modified Flush Steel (JCTUBE23) — Informational Overview
The Beretta USA MobilChoke 20 gauge choke tube in Modified constriction is a flush-fit steel choke designed for shotguns that use the MobilChoke system. This model is identified by part number JCTUBE23 and UPC 082442009650. Flush choke tubes sit close to the muzzle line for a streamlined exterior profile while providing a defined constriction intended to shape shot patterns for specific use distances and loads.
Modified constriction is one of the most commonly used choke options in 20 gauge setups because it often provides a balanced pattern—tighter than Improved Cylinder yet more open than Improved Modified or Full—though actual results depend heavily on ammunition, shot type, wad design, and barrel characteristics.
Key Identifiers
MobilChoke System Compatibility: Confirm Before Use
Choke tube thread patterns are not universal, even within the same brand. Beretta uses multiple choke systems (including MobilChoke and other families), and they are not interchangeable. For correct fitment, users typically confirm:
The shotgun is specifically cut for the MobilChoke system
Existing choke tubes (if any) are marked MobilChoke
The part number JCTUBE23 appears on a compatibility list for the specific shotgun model
This compatibility check helps prevent thread damage and ensures proper seating and alignment.
Modified Constriction: General Patterning Characteristics
A Modified choke is commonly selected when a user wants a pattern that is more concentrated than Improved Cylinder but still not as tight as Improved Modified or Full. Pattern performance can vary based on:
Shot size and material (lead, steel, etc.)
Wad design
Payload and velocity
Barrel geometry and forcing cone characteristics
For pattern-dependent applications, many owners test (“pattern”) with their specific loads to see real-world results at the distances they use most.
Flush-Fit Profile: Streamlined Exterior
A flush choke tube is designed to sit nearly even with the muzzle, which many users prefer for:
A clean exterior look
Reduced snagging on cases, sleeves, or brush
Traditional appearance compared with extended tubes
Compared with extended choke tubes, flush models may require a choke wrench for removal and can make it less convenient to read markings without removing the tube (depending on how the tube is marked).
Steel Construction: Durability and Maintenance
This choke tube is listed as steel, a common material choice for choke tubes because it supports thread durability and long service life. Typical maintenance practices include:
Cleaning the choke tube and barrel threads periodically
Using appropriate choke tube lubricant/grease (per manufacturer guidance)
Confirming the tube is fully seated before use
Checking periodically during longer shooting sessions
Proper maintenance can help reduce carbon buildup and make removal easier.
Safety Notes
Use only choke tubes that match the shotgun’s choke system (MobilChoke here).
Ensure the choke tube is installed correctly and fully seated.
Follow manufacturer guidance regarding ammunition compatibility and any restrictions.
Quick Reference Summary
Beretta USA MobilChoke
20 Gauge, Modified
Flush fit, steel
MPN: JCTUBE23
UPC: 082442009650
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