14 Crosman 2240 Ar Stock Adapter of 2026 For Carbine Conversions

1

Crosman RMCOIL Silicone Chamber Oil (.25-Ounce)

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  9.2
• Brand
  Crosman

Key specs2

Lubricant Type

Silicone chamber oil

Container Capacity

0.25-ounce bottle

Pros & cons32

Pros

• Formulated specifically as silicone chamber oil for airgun maintenance
• Compact 0.25-ounce bottle fits neatly into a bench toolkit or field bag
• Helps preserve internal seals and maintain consistent valve cycling

Cons

• Small 0.25-ounce volume requires replenishment during frequent bench maintenance
• Does not serve as a frame mounting component or structural carbine hardware

2

Shrike Precision Steel Front Sight Adapter + Front Sight for

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  -
• Brand
  Shrike Precision

Key specs2

Material Build

Blued alloy steel

Thread Pitch

1/2-20 UNF with thread protector

Pros & cons42

Pros

• Constructed from durable blued alloy steel for rigid barrel attachment
• Integrated 1/2-20 muzzle threads allow mounting standard threaded accessories
• Includes a thread protector to keep muzzle threads safe when bare
• Preserves a dedicated front sighting post on the Crosman 2240 barrel

Cons

• Adds forward muzzle weight compared to factory plastic front sight assemblies
• Requires proper sight alignment to match rear sight or elevated optic comb heights

3

Picatinny Rail Mount - Crosman 2240 Compatible Aftermarket - Red

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  -
• Brand
  Generic

Key specs2

Accessory Interface

Picatinny rail

Optic Compatibility

Supports red dot sights, scopes, lasers, and flashlights to raise your sight line above a carbine stock comb.

Pros & cons32

Pros

• Adds a standard Picatinny interface directly to the Crosman 2240 platform
• Accommodates elevated red dots, scopes, lasers, or tactical flashlights
• Helps solve line-of-sight misalignment when adding higher carbine buttstocks

Cons

• Listing does not state material composition so confirm whether polymer or metal
• Fastener torque specifications are not stated and require careful tightening

4

MDT Hunting Firearm to Fixed Stock Adapter, Compatible Hunting Firearm

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  -
• Brand
  MDT

Key specs2

Length of Pull Extension

0.75 inches

Stock Interface Type

Designed for fixed stock chassis systems and requires intermediate hardware to fit Crosman 2240 pistol tubes.

Pros & cons32

Pros

• Extends length of pull by 0.75 inches for improved shoulder ergonomics
• Provides a dedicated fixed stock interface for custom rifle chassis setups
• Finished in black to match tactical frame and stock builds

Cons

• Engineered for hunting firearm chassis interfaces rather than 2240 tube caps
• Requires an intermediate adapter plate or custom chassis to fit a 2240 tube

5

Grip Adapter for Crosman

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  -
• Brand
  Generic

Key specs1

Frame Attachment

Adapts the standard Crosman grip frame section to accept aftermarket grip configurations.

Pros & cons32

Pros

• Mounts directly to Crosman grip frames to adapt grip profile and ergonomics
• Allows custom grip handling for improved stabilization during shoulder fire
• Maintains a dedicated replacement interface for factory Crosman lower frames

Cons

• Listing lacks fastener specifications so verify screw thread match before installation
• Does not include an integrated rear buffer tube thread for direct AR stock mounting

6

Crosman 1377 Custom Shoulder Stock

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  -
• Brand
  Crosman

Key specs2

Stock Design

Skeleton shoulder stock

Frame Installation

Installs directly onto factory Crosman grip frame screw points without requiring frame drilling.

Pros & cons42

Pros

• Attaches directly to factory Crosman grip screw points without drilling or tapping
• Provides immediate shoulder support to stabilize shots and shrink group sizes
• Lightweight skeleton construction adds minimal carry weight to the airgun
• Maintains factory comb height alignment for low-profile iron sights

Cons

• Uses a proprietary skeleton layout rather than a threaded AR buffer tube interface
• Fixed length of pull cannot be adjusted for shooters needing custom reach

7

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

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  -
• Brand
  SQOTDR

Key specs2

Barrel Compatibility

11mm outer diameter Crosman barrels

Thread Pitch

1/2-20 UNF stainless steel

Pros & cons32

Pros

• Machined from stainless steel for corrosion resistance and thread strength
• Features standard 1/2-20 UNF muzzle threading for airgun accessories
• Fits 11mm outer diameter barrels across Crosman 2240, 1377, 1322, 2250, and 2260 models

Cons

• Only fits 11mm outer diameter barrels and will not clamp onto non-standard sleeves
• Serves front muzzle moderation rather than rear frame stock mounting

8

UnderAlert Buttstock Adapter with Metal D Ring and Touch Fastener,

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• Brand
  UnderAlert

Key specs2

Hardware Attachment

Touch fastener with metal D-ring

Package Quantity

2 pack

Pros & cons32

Pros

• Includes a 2-pack of wear-resistant straps with integrated metal D-rings
• Secures via touch fastener around carbine buttstocks without modifying hardware
• Replaces traditional swivel studs to enable flexible tactical sling attachment

Cons

• Acts as a sling strap adapter rather than a structural buffer tube frame mount
• Requires an existing shoulder stock or buffer tube to strap onto

9

Shrike Precision Crosman 2240 Adjustable Sear Spring for 22xx &

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• Brand
  Shrike Precision

Key specs1

Trigger Tuning

Replaces the factory sear spring with an adjustable unit to dial in trigger pull on 22xx and 13xx frames.

Pros & cons32

Pros

• Provides adjustable tension to tune the trigger pull weight on 22xx and 13xx frames
• Helps reduce trigger creep to complement stable shoulder-stocked shooting
• Direct drop-in fit inside factory Crosman grip housings without frame cutting

Cons

• Requires opening the grip frame side cover and handling small internal components
• Modifies trigger release tension rather than mounting a buttstock to the receiver

10

Picatinny Red Dot Mount Rail for Crosman 2240 1322 1377

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• Brand
  Takteq

Key specs2

Receiver Mounting

Installs in place of the factory rear sight so you can mount an optic without buying a steel breech.

Material Build

Lightweight nylon polymer

Pros & cons42

Pros

• Replaces the factory rear sight to mount red dots without needing an aftermarket steel breech
• Molded from durable nylon polymer to keep receiver weight low
• Elevates optics to an ergonomic height suited for carbine stock cheek weld
• Fits multiple Crosman platforms including 2240, 1322, 1377, 1399, and 362 models

Cons

• Nylon polymer build requires careful screw tightening to avoid stripping mounting threads
• Eliminates the factory rear open sight notch during installation

11

SQOTDR Black Aluminium Alloy Variable Pump Band & Silencer Adapter

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• Brand
  SQOTDR

Key specs1

Barrel Attachment

Clamps around Crosman 1377 and 1322 variable pump tubes to align the barrel and muzzle interface.

Pros & cons32

Pros

• Constructed from durable black aluminum alloy for rigid barrel and tube support
• Combines a pump tube band with a threaded muzzle adapter in a single assembly
• Provides a clean forward mounting solution for 1377 and 1322 multi-pump frames

Cons

• Engineered specifically for variable pump tubes and does not clamp onto 2240 CO2 main tubes
• Does not provide shoulder stock mounting points for rear frame carbine conversions

12

Crosman 407T Replacement 10-Round Rotary Magazine (3-Count)

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• Brand
  Crosman

Key specs2

Magazine Capacity

10 rounds per rotary clip

Package Quantity

3 pack

Pros & cons32

Pros

• Provides 10-round rotary capacity for rapid shooting sessions
• Comes in a 3-pack to keep extra loaded rounds ready at the bench
• Compact circular design allows fast loading into compatible Crosman repeaters

Cons

• Designed for 407T repeating mechanisms and does not fit single-shot 2240 breeches
• Does not function as a stock adapter or receiver carbine component

13

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

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• Brand
  3DEXL

Key specs2

Rail Length

8 1/4 inches with 21 slots

Optic Mounting Space

Provides 21 Picatinny rail slots over an 8 1/4-inch span for flexible scope ring placement and proper eye relief.

Pros & cons42

Pros

• Extended 8 1/4-inch length provides 21 slots of Picatinny rail space
• Accommodates full-size rifle scopes and cantilever optic mounts on Crosman airguns
• Provides tall optic clearance to achieve comfortable cheek weld with shoulder stocks
• Spans across the barrel assembly to maximize eye relief positioning

Cons

• Long 8 1/4-inch rail profile adds top-heavy bulk to shorter pistol configurations
• Listing specifies 1377 and 1322 compatibility so verify barrel diameter before fitting on a 2240

14

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

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• Brand
  3DEXL

Key specs2

Rail Length

6.9 inches with 16 slots

Sight Elevation

Delivers 16 Picatinny slots across 6.9 inches, lifting optics to match elevated carbine stock comb heights.

Pros & cons42

Pros

• Compact 6.9-inch profile offers 16 slots of rail space without excessive overhang
• Weaver and Picatinny mounting standard fits standard optic rings and red dots
• Raises sight height above the bore to align naturally with carbine buttstocks
• Lighter and more compact than full-length 8 1/4-inch rail adapters

Cons

• Listing specifies 1377 and 1322 fitment so check tube clamping clearance on a 2240
• Provides less forward rail room than longer 21-slot adapters for bulky optics

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

Does an AR stock adapter replace the rear tube cap and hammer spring guide on a Crosman 2240?

It depends on the adapter design, as some models replace the factory rear tube cap directly while others bolt around the frame. When an adapter replaces the rear cap, verify that it features an internal recess or guide post designed to seat the factory hammer spring. If the internal cavity is too shallow or misaligned, the spring binds under compression, which limits hammer travel and causes inconsistent CO2 valve release. If you choose a grip adapter for Crosman frames that secures through external mounting points, your factory rear plug remains untouched.

Will an AR stock adapter mount to the factory 2240 frame without cutting metal?

Yes, standard aftermarket conversion adapters mount using existing screw holes or the rear tube opening without permanent drilling, cutting, or tapping. Most designs fasten directly through the factory rear cap retention hole or secure under the grip panel screws. Always verify the mounting instructions before installation, especially if you have modified internal trigger components like an aftermarket adjustable sear spring that shares frame space.

Do you need elevated optics to match the comb height of an AR stock?

Usually yes, because an inline AR buffer tube raises your cheek weld significantly higher than the low factory sights. Aligning your eye with the stock plastic rear notch becomes awkward or physically impossible once a straight buttstock is in place. Installing a Picatinny red dot mount rail or a clamping scope rail provides the height needed for natural sight alignment, helping you turn your pistol into a comfortable tactical air rifle style carbine platform.

How does an AR stock adapter differ from a factory custom shoulder stock?

A factory custom shoulder stock replaces the grip panels entirely as a fixed polymer unit, whereas an AR stock adapter adds a threaded interface for buffer tubes. The AR adapter allows you to install collapsible or fixed commercial and mil-spec stocks, adjust your length of pull, and swap shoulder rests easily. This gives your pistol greater versatility than a fixed one-piece stock, making it feel much more stable during rapid plinking sessions than a standard CO2 BB gun.

Will an AR stock adapter interfere with an aftermarket breech or Picatinny scope mount?

No, an AR adapter typically mounts at the lower rear tube or grip area, leaving the upper breech clear for optic bases. Whether you install a rear sight replacement rail or a clamped barrel rail, both components operate in separate zones of the pistol. You should still check the clearance around the rear breech screw to ensure the top lip of the adapter does not pinch the cocking bolt path or prevent the screw from tightening down fully.

How do you prevent an AR stock adapter from wobbling or stripping frame threads?

Preventing play requires even torque and checking that the adapter body clamps squarely against the tubular steel receiver. Start every mounting screw by hand to avoid cross-threading into the frame tube, and never over-tighten fasteners into soft cast metal. If the buffer tube itself has slight rotational play inside the adapter threads, verify whether the adapter includes a set screw or lock ring to clamp the tube threads securely in place.