8 Crosman 2240 Stock Adapter of 2026 For Carbine Conversions

1

Grip Adapter for Crosman

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  8.4
• Brand
  Generic

Key specs2

Mounting Location

Installs at the Crosman pistol grip area rather than the rear tube cap.

Compatibility Check

Verify 2240 frame fit

Pros & cons32

Pros

• Designed to adapt Crosman grip frames for aftermarket accessories
• Serves as a mounting base on Crosman pistol grip configurations
• Compact profile mounts directly around the grip frame section

Cons

• Specific Crosman model compatibility is unlisted and requires verification
• Hardware specs and construction materials are omitted from the listing

2

Crosman 1377/1322 UNI Suppressor Adapter

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  8.9
• Brand
  Generic

Key specs2

Accessory Function

Muzzle suppressor mount

Frame Relevance

Mounts to the front barrel rather than serving rear shoulder stock conversion needs.

Pros & cons32

Pros

• Dedicated front barrel adapter for Crosman 1377 and 1322 air pistols
• Direct slip-on or screw-on muzzle accessory mounting interface
• Lightweight muzzle accessory option that adds minimal forward bulk

Cons

• Functions as a muzzle adapter rather than a rear shoulder stock mount
• Designed for 1377 and 1322 pump barrels rather than standard 2240 CO2 tubes

3

Stainless Steel Silencer Adapter 1/2 20 UNF for Crosman 11mm

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  7.1
• Brand
  SQOTDR

Key specs3

Barrel Fitment

11mm Crosman barrels

Thread Standard

1/2-20 UNF

Muzzle Hardware Role

Supplies muzzle threads for 11mm Crosman barrels but does not attach rear carbine buttstocks.

Pros & cons32

Pros

• Machined from stainless steel for durable barrel attachment
• Standard 1/2-20 UNF external threading for compatible muzzle devices
• Listed compatibility across 11mm Crosman barrels including the 2240 and 2250

Cons

• Mounts strictly to the muzzle end and does not provide shoulder stock support
• Thread compatibility requires matching 1/2-20 UNF accessory fittings

4

SQOTDR Air Transfer Port for Crosman/Pistol 1377 1322 2240 2300

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  9.0
• Brand
  SQOTDR

Key specs2

Component Type

Internal air transfer port

Platform Scope

• Crosman 2240, 2300, 2400
• Crosman 1377, 1322, 2289
• Crosman 2250, 2260

Pros & cons32

Pros

• Fits internal air pathways across Crosman 2240, 1377, 1322, and 2250 models
• Broad platform fitment covering both pneumatic pump and CO2 pistol frames
• Replaces internal transfer port hardware during carbine strip-downs

Cons

• Internal airflow component that provides no exterior stock mounting interface
• Requires disassembly of the breech and tube assembly to install

5

3DEXL Scope Rail Mount Adapter for Crosman 1377, 1322 Weaver

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  8.9
• Brand
  3DEXL

Key specs2

Rail Specification

• 16-slot Picatinny rail
• 6.9-inch overall length
• 17.5mm mount width

Mount Purpose

Adds upper rail slots for sights and scopes but offers no rear buttstock attachment.

Pros & cons32

Pros

• Provides a 16-slot Weaver Picatinny platform for optics attachment
• Listed length of 6.9 inches provides substantial optic ring positioning space
• Standard 17.5mm mount width matches target Crosman pump platforms

Cons

• Serves optics mounting rather than buttstock shoulder conversion
• Listed for 1377 and 1322 platforms without stated 2240 breech confirmation

6

Crosman 1377 Custom Shoulder Stock

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  8.6
• Brand
  Crosman

Key specs2

Stock Configuration

Direct grip-mount skeleton stock

Carbine Conversion Fit

Replaces side grip panels to lock securely onto standard Crosman pistol frames without altering the rear tube cap.

Pros & cons42

Pros

• Authentic Crosman factory shoulder stock designed for pistol-to-carbine conversion
• Directly stabilizes shooting posture by replacing factory plastic grip panels
• Eliminates the need for separate buffer tube adapters or intermediate brackets
• Rigid synthetic design preserves access to the rear tube and hammer spring plug

Cons

• Uses fixed length of pull with no telescoping or folding adjustment
• Cheek weld height is optimized for low sights rather than high scope mounts

7

3DEXL Scope Rail Mount Adapter for Crosman 1377, 1322 Weaver

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  8.7
• Brand
  3DEXL

Key specs2

Top Rail Dimensions

• 21-slot Picatinny profile
• 8 1/4-inch full length
• 20mm rail width

Optic Platform Focus

Provides full-length scope mounting space along the top of the barrel rather than buttstock support.

Pros & cons32

Pros

• Full-length 8 1/4-inch rail offers extended eye-relief adjustment
• 21 Picatinny slots accommodate larger optics or red dot accessories
• 20mm Weaver Picatinny profile delivers broad sighting system compatibility

Cons

• Upper sighting rail that does not resolve rear shoulder stock mounting
• Stated compatibility covers 1377 and 1322 rather than confirmed 2240 breeches

8

SQOTDR Black Aluminium Alloy Variable Pump Band & Silencer Adapter

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  8.9
• Brand
  SQOTDR

Key specs2

Material Build

Black aluminium alloy

Front Assembly Focus

Secures the front pump tube and barrel assembly on multi-pump models without rear frame fitment.

Pros & cons32

Pros

• Black aluminium alloy construction offers rigid front-end barrel clamping
• Combines pump band stabilization with a front muzzle adapter
• Securely mounts to Crosman 1377 and 1322 variable pump pneumatic barrels

Cons

• Front barrel pump band does not connect or adapt shoulder stocks
• Sized for variable pump frames rather than 2240 CO2 main tubes

Last update on 2026-10-12 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Does the Crosman custom shoulder stock mount directly to a 2240 pistol?

Mounting compatibility depends on your specific frame layout. The Crosman 1377 Custom Shoulder Stock is designed around the standard Crosman grip frame pattern, but you should confirm grip screw spacing before installing it on a 2240. If your pistol uses aftermarket grips or non-standard panels, pairing the setup with a dedicated Grip Adapter for Crosman ensures a rigid fit without forcing screws or stressing the frame.

Which adapter lets you attach an aftermarket stock to the 2240 grip frame?

A dedicated Grip Adapter for Crosman allows you to mount an external shoulder stock directly to the pistol handle. Before securing the hardware, verify that the adapter hole spacing aligns with the grip frame and steel main tube. A proper match prevents stripped screw holes and eliminates unwanted play during target practice or field shooting.

Will an adapter interfere with the hammer spring plug or rear tube access?

It depends on how the mounting hardware attaches to the gun. Adapters that replace the factory grip panels leave the rear tube clear, while tube-mounted hardware attaches near the rear plug. If you install an adapter at the back of the cylinder, check that it does not compress the hammer spring, alter spring alignment, or block access to internal components.

Can you add optics when converting a 2240 into a shoulder-fired carbine?

Yes, raising your sight line is often necessary once you add a shoulder stock. Rail adapters such as the 3DEXL Scope Rail Mount Adapter for Crosman 1377 and 1322 Weaver Picatinny 17.5mm 6.9-inch 16 slot, or the 20mm full length 8 1/4-inch version, clamp over compatible steel breaches to give you a stable optic base. Securing a firm mount provides repeatable cheek weld and steady shot placement matching a dedicated tactical air rifle configuration.

How do parts compare across the 2240 and pump platforms like the 1377?

While internal and external components often overlap across platforms, powerplants require specific hardware. For example, parts like the SQOTDR Air Transfer Port explicitly list cross-platform fit across 1377, 1322, 2240, 2300, 2400, 2250, 2260, and 2289 models. However, because the 2240 runs on 12-gram CO2 cartridges rather than a multi-pump pneumatic assembly, you must verify that stock hardware mounts to the grip frame rather than interfering with CO2 piercing caps.

What steps prevent shoulder stock wobble after installation?

Check that all mounting screws seat flush into the grip frame without bottoming out in blind threads. Any gap between the adapter and the steel frame introduces flex, which disrupts sighting just like loose furniture on a backyard CO2 BB gun. Tighten fasteners evenly and confirm that the mounting plate does not pinch the internal hammer mechanism or trigger linkages.