11 Crosman 2100 B of 2026 To Restore Lost Compression

1

Crosman Pumpmaster 2200 2100 B & Classic C Pump Piston

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  7.2
• Brand
  JL Missouri Parts & Misc.

Key specs2

Pump Linkage Role

This lever replaces a bent or worn internal piston arm to restore smooth mechanical leverage during every pump stroke.

Component Weight

0.25 lb

Pros & cons42

Pros

• Genuine OEM Crosman replacement lever helps restore worn pumping linkage
• Direct fit design matches 2100 B, Classic C, and 2200 pump platforms
• Lightweight 0.25-pound build maintains proper balance along the pump stroke
• Factory black finish blends cleanly with original receiver and stock parts

Cons

• Does not include the forearm handle casing or pivot pins
• Requires partial receiver disassembly to access the pump linkage pin

2

JL Missouri Parts Crosman Pumpmaster 2100 B Valve Assembly Pellet

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  8.6
• Brand
  JL Missouri Parts

Key specs2

Pressure Retention

Replacing the complete internal valve resolves chronic air leakage where compressed air escapes immediately after pumping.

OEM Part Number

2200L021

Pros & cons32

Pros

• Factory 2200L021 valve assembly directly replaces leaking air chambers
• Solves air loss issues where the rifle fails to store pressure across pumps
• Built specifically for the 2100 B platform to ensure tight internal sealing

Cons

• Listing does not include a replacement pump cup for the piston head
• Requires checking internal tube dimensions before seating the valve

3

Crosman Pumpmaster 2100 B Stock BB Load Door Cover Plate

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  9.1
• Brand
  JL Missouri Parts & Misc.

Key specs1

BB Reservoir Access

Keeps internal BB storage secured inside the synthetic buttstock so ammunition feeds cleanly into the reservoir without spilling.

Pros & cons32

Pros

• Replaces missing or broken sliding BB reservoir doors on the buttstock
• Prevents loose BBs from spilling out during transport and field carry
• Formed to match the factory stock contours of the Crosman 2100 B

Cons

• Listing covers only the door plate and excludes mounting screws or springs
• Color matching to sun-faded vintage stocks must be verified by the buyer

4

JL Missouri Parts Crosman Pumpmaster 2100 B Forearm Hold Hold

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  9.0
• Brand
  JL Missouri Parts

Key specs1

Pump Handle Fit

Replaces cracked exterior forearm plastic so shooters can comfortably cycle up to the maximum recommended pump count.

Pros & cons32

Pros

• Direct replacement pump handle forearm for cracked or split exterior grips
• Provides proper hand purchase when cycling high compression pump strokes
• Designed to fit Crosman Pumpmaster 2100 B linkage channels

Cons

• Metal linkage pins and internal piston levers are sold separately
• Buyer must verify hinge pin alignment during installation

5

Hunting Scope for Crosman Classic 2100

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  8.0
• Brand
  Trinity

Key specs1

Optic Compatibility

Engineered to fit the Crosman Classic 2100 receiver rail to help aim more precisely than factory open sights allow.

Pros & cons32

Pros

• Tailored specifically to mount on the Crosman Classic 2100 airgun receiver
• Replaces basic open iron sights to improve target acquisition downrange
• Provides optical magnification for backyard plinking and pest control

Cons

• Magnification power and objective lens diameter are not stated by manufacturer
• Buyer must confirm rail interface width and ring clearance prior to mounting

6

Black R Stock Butt Pellet BB Gun Air Rifle Part

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  7.6
• Brand
  JL Missouri Parts & Misc.

Key specs1

Stock Replacement Fit

Provides full shoulder support for 2100 and 2200 B air rifles, restoring proper shooting stance and cheek weld.

Pros & cons32

Pros

• Replaces damaged or cracked buttstocks on Crosman 2100 and 2200 B rifles
• Factory black finish matches original aesthetic and exterior parts
• Restores shoulder support and proper cheek weld for steady shooting

Cons

• Mounting hardware and receiver fastening screws are not included in the listing
• BB loading door cover must be purchased separately if your original is missing

7

JL Missouri Parts Crosman Pumpmaster 2100 B Right Side RH

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  7.8
• Brand
  JL Missouri Parts

Key specs2

Right Side Barrel Support

Secures the right side of the barrel to the pump tube, eliminating play that disrupts iron sight or scope zero.

Barrel Band Part Number

766C005

Pros & cons32

Pros

• Authentic 766C005 right-hand barrel band maintains barrel and tube alignment
• Replaces cracked or stripped plastic bands that cause barrel wobble
• Direct fit specification for Crosman Pumpmaster 2100 B models

Cons

• Left-hand side band 766C004 is sold separately and not bundled
• Fastening screws must be reused from the original rifle assembly

8

JL Missouri Parts Crosman Pumpmaster 2100 B Left Side LH

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  8.3
• Brand
  JL Missouri Parts

Key specs2

Left Side Barrel Support

Clamps the left side of the barrel assembly to prevent shifting when pumping force flexes the front end.

LH Band Part Number

766C004

Pros & cons32

Pros

• OEM-matched 766C004 left-hand barrel band completes receiver forward clamping
• Prevents barrel flex against the compression tube during pumping cycles
• Drop-in replacement for worn or fractured left side factory bands

Cons

• Must be paired with right-hand band 766C005 for a complete barrel clamp
• Cross-pin or retaining screw is not included with the single band piece

9

Crosman 2100 A B Classic Rebuild Kit, Aluminum Valve Assembly,

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  8.0
• Brand
  JL Missouri Parts & Misc.

Key specs2

Compression Restoration

Combines an aluminum valve assembly with a push-in pump cup to solve both compression stroke loss and chamber leakage.

Rebuild Set Contents

• Complete aluminum valve assembly 2200K021
• Push-in pump cup seal 760-140
• OEM internal chamber seal set

Pros & cons42

Pros

• All-in-one rebuild bundle includes both complete valve assembly and pump cup
• Durable aluminum valve body replaces degraded factory air chamber components
• Includes 760-140 push-in pump cup to restore maximum compression stroke seal
• Fits 2100 A, 2100 B, and Classic rebuilds using OEM-spec 2200K021 assembly

Cons

• Requires full teardown of pump tube and valve chamber to install components
• Assembly lubricant is not bundled and must be supplied by the user

10

JL Missouri Parts Crosman Pumpmaster 760 B 2100 B Rear

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  9.3
• Brand
  JL Missouri Parts

Key specs1

Elevation Adjustment

Provides stepped height adjustment beneath the rear sight blade to dial in vertical pellet impact at varied distances.

Pros & cons32

Pros

• Stepped ramp allows precise vertical elevation adjustment for open iron sights
• Direct fit replacement for lost or damaged rear sight elevators on 2100 B and 760 B
• Slides under the rear sight leaf without requiring full rifle disassembly

Cons

• Does not include the rear sight blade or notch assembly
• Stepped friction fit can dislodge if snagged during rough brush carry

11

JL Missouri Parts New Screw on Rear Sight Notch for

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  9.7
• Brand
  JL Missouri Parts

Key specs2

Rear Sight Mounting

Screws onto the barrel housing to re-establish a defined rear sighting notch for target plinking and pest aiming.

Notch Part Number

262A200

Pros & cons32

Pros

• Factory 262A200 screw-on rear sight notch replaces broken or rounded sight blades
• Cross-compatible with Crosman 760 Pumpmaster, 2100 B, and 766 models
• Clean notch profile restores sharp sight picture for accurate open-sight shooting

Cons

• Mounting screw is not guaranteed in the listing and may need to be retained
• Requires pairing with an elevator ramp to adjust vertical point of impact

Last update on 2026-10-13 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Why is my Crosman 2100 B failing to build or hold air pressure?

A degraded pump cup or a compromised internal valve prevents your rifle from compressing air. When these seals wear flat or harden, air simply leaks out past the piston or valve face during the pump stroke instead of charging the pressure chamber. Installing an OEM rebuild kit featuring an aluminum valve assembly and push-in pump cup restores full compression. If you decide to transition from maintaining a multi-pump rifle to a modern tactical platform, check out a tactical air rifle for target practice and pest control.

Which rebuild kit matches the Crosman 2100 B valve and pump cup assembly?

Look for the rebuild set listed under part numbers 2200K021 and 760-140. This OEM package contains a complete aluminum valve assembly alongside the proper push-in pump cup, fitting Crosman 2100 A, 2100 B, and Classic models. You can also source individual replacement valve assemblies under part number 2200L021 if your outer pump cup remains in serviceable condition.

How do I replace cracked barrel bands on a Crosman 2100 B?

You must replace both halves individually because the barrel band uses a split two-piece design. The left-hand side requires part number 766C004, while the right-hand side requires part number 766C005. Both components clamp together around the outer barrel and pump tube to restore proper alignment and eliminate barrel wobble.

Which parts do I need to restore missing rear iron sights on a 2100 B?

Restoring the factory rear sight requires two separate components: a sight notch plate and an elevation ramp. Locate the screw-on rear sight notch under part number 262A200, which fits the 2100 B, 760 Pumpmaster, and 766. Slide the stepped rear sight elevator underneath the notch leaf to allow vertical elevation adjustments for different shooting distances.

Can I mount a scope to the Crosman Classic 2100 receiver?

Yes, you can attach a hunting scope designed specifically for the Crosman Classic 2100 receiver grooves. Adding a dedicated optic provides better target clarity than open sights when aiming at small targets. If you need a secure place to store your scoped rifle alongside the rest of your collection, verify capacity in a 12 long gun safe.

What replacement lever fits a bent or loose pump arm linkage?

Install the OEM black pump piston lever listed under part number 2200B013. This replacement component weighs 0.25 pounds and is designed for the Crosman Pumpmaster 2100 B, 2200, and Classic C. Replacing a warped lever alongside the forearm stock arm eliminates binding during the pump stroke and brings back consistent leverage.