4 Crosman 1377 Magazine of 2026 For Faster Reloads

1

Pump Head Seal Cup Gasket BB Air Push in. Intended

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• ARS Mark

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  8.8
• Brand
  JL Missouri Parts & Misc.

Key specs2

Pneumatic Component Type

Push-in pump head seal cup

Supported Crosman Models

• Crosman 1377 and 1322
• Crosman 760 and 766
• Crosman PC77, 2100, 2200, and 2289

Pros & cons43

Pros

• Push-in design allows straightforward replacement on the pump piston head
• Restores compression pressure during breech teardown or rebuild projects
• Fits a wide range of Crosman models including 1377, 1322, PC77, and 760
• Maintains pump tube sealing when upgrading or servicing pneumatic internals

Cons

• Addresses internal air compression only and does not add a magazine or feed system
• Requires disassembly of the pump tube and valve assembly to install
• Listing does not specify cup material composition or durometer hardness

2

3DEXL Scope Rail Mount for Crosman 1377 1322 Weaver Picatinny

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• ARS Mark

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  7.6
• Brand
  3DEXL

Key specs2

Rail Specifications

• 3.75-inch overall length
• 9 Picatinny and Weaver slots
• 20mm rail width profile

Loading Port Clearance

The compact 3.75-inch length minimizes overhang near the breech, preserving access when inserting pellets into the chamber.

Pros & cons42

Pros

• Compact 3.75-inch rail leaves ample clearance around the loading port for pellets
• Provides 9 Picatinny slots for mounting compact red dots or pistol scopes
• Standard 20mm Weaver and Picatinny profile accepts common optic rings
• Compatible directly with both Crosman 1377 and 1322 platforms

Cons

• Short 3.75-inch span limits optic ring spacing and eye relief adjustments
• Listing does not state construction material or mounting screw torque limits

3

SQOTDR Metal Band for Crosman Pumper Longer Barrel Than 1377

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• ARS Mark

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  7.2
• Brand
  SQOTDR

Key specs2

Barrel Compatibility

Requires barrel longer than stock 1377/1322

Structural Support

The metal construction braces extended custom barrels against the pump tube while providing an integrated front sight post.

Pros & cons43

Pros

• Solid metal construction provides rigid support between pump tube and barrel
• Includes an integrated front sight for open-sight target shooting
• Stabilizes custom extended barrels longer than factory 1377 and 1322 lengths
• Prevents barrel shift during repetitive pump strokes on modified builds

Cons

• Incompatible with standard factory-length 1377 and 1322 barrels
• Listing does not include specific barrel outer diameter measurements
• Rear sight pairing and elevation compatibility are not specified

4

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

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• ARS Mark

  ARS Mark is a ranking system developed by bestairriflescopes.com. ARS Mark has no relationship or impact from any manufacturers or sales agent websites. Learn more

  5.8
• Brand
  3DEXL

Key specs2

Optic Mounting Span

• 8 1/4-inch full-length bridge
• 21 Weaver and Picatinny slots
• 20mm base width

Receiver Coverage

Spans 8 1/4 inches across the receiver and barrel to offer 21 mounting slots, requiring careful check of clearance around the pellet feed port.

Pros & cons42

Pros

• Full-length 8 1/4-inch rail delivers maximum positioning flexibility for optics
• 21 Picatinny slots accommodate long eye-relief scopes or multiple accessories
• Standard 20mm Weaver Picatinny width fits standard optic rings and bases
• Fits both Crosman 1377 and 1322 pneumatic airgun receivers

Cons

• Extended 8 1/4-inch rail spans across the receiver and can crowd breech loading access
• Listing does not specify mounting hardware or construction material

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

Does the Crosman 1377 accept a drop-in factory magazine?

No, the factory Crosman 1377 is strictly a single-shot multi-pump pneumatic air pistol built with a standard single-load breech. Adding multi-shot repeating magazine capabilities requires installing an aftermarket repeater breech or a specialized clip conversion kit designed to cycle .177 pellets. Before purchasing any feeder system, verify that your breech has the appropriate cutouts and bolt probe travel to chamber pellets without jamming.

Will a Picatinny scope mount clear the loading port for magazine clips?

It depends on the rail length and the clearance height of your magazine feeder. A compact rail like the 3DEXL Scope Rail Mount for Crosman 1377 1322 Weaver Picatinny 20mm 3.75” 9 Slot leaves ample open breech space for inserting and rotating taller multi-shot clips. If you select an extended bridge like the 3DEXL Scope Rail Mount Adapter for Crosman 1377, 1322 Weaver Picatinny 20mm Full Length 8 1/4" 21, check that your magazine height does not strike the underside of the rail or interfere with your optic rings.

How do you maintain barrel stability when installing custom breech and sight setups?

Installing an aftermarket metal barrel band locks the barrel directly to the pump cylinder to prevent shifting, loose tolerances, and wandering zero. The SQOTDR Metal Band for Crosman Pumper Longer Barrel Than 1377 1322 with Sight secures extended barrel configurations while maintaining front sight alignment. Check your exact outer barrel diameter and front sight base against the product listing before mounting. If you want a ready-to-shoot multi-shot system without custom assembly, checking a dedicated tactical air rifle may provide a simpler alternative.

Why does a Crosman 1377 lose pump pressure after receiver disassembly?

Receiver teardowns often disturb, twist, or tear the compression cup inside the pump tube, causing pressurized air to bypass the valve. Replacing a damaged part with the JL Missouri Parts & Misc Pump Head Seal Cup Gasket BB Air Push in restores airtight compression on the Crosman 1377, as well as compatible models like the 760, 766, 1322, PC77, 2100, 2200, and 2289. Always confirm that the replacement cup pushes completely flat into the pump head without pinching during reassembly.

Can you shoot steel BBs through a 1377 magazine conversion kit?

Most aftermarket repeating magazines for this platform feed .177 lead pellets and will bind or malfunction if loaded with round steel BBs. Rifled barrels on target pumpers are intended for lead projectiles, and feeding BBs through a pellet rotor can cause double feeds or breech blockages. Always verify ammo compatibility in your specific magazine manual, or look into a multi-shot CO2 BB gun if rapid-fire steel BB plinking is your primary goal.

Do you need a modified bolt probe to run repeater clips?

Yes, most magazine conversions require an extended or tapered bolt probe to smoothly push pellets out of the magazine channel and seat them past the transfer port. A standard factory bolt probe often lacks the length or profile needed to cycle through rotary magazine walls cleanly. Check your conversion kit specifications to ensure the proper probe is included with your breech hardware.