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Questions & Answers
What’s needed to add the extension? Expert Answer

All parts needed are provided. Keep in mind all OEM mags from Jan 2021 and forward only allow for 3 extra rounds, as Glock changed the length of the OEM spring.

by Brandon B, Gear Expert, October 7, 2021
Customer Reviews
Helpful Positive Review
Great little upgrade providing more rounds in this little gun and added extension to the grip. Watched some YouTube videos on installing this and had no issues. No feed issues and reliable with the Glock 42. I have upgraded all my mags with this exte...
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1/1 found this helpful
Helpful Negative Review
Don't say I didn't tell you so... by Xman, Verified Owner, January 12, 2019
OMG is this a hunk of junk. I've spent two days just trying to put it together! They want you to pry these two pieces apart while pushing one spring up and one spring down while trying the get the mag ridges down between the two pieces, all at the ...
Read More...
2/12 found this helpful
Read All 2 Reviews
Color:
Black
Magazine Capacity:
4 Round
Gun Make:
Glock
Gun Model:
Glock 42

Code: 1S0-PME-FDG42RM-FX-4210B-4RD

MPN: FX-4210B

UPC: 7290111585005

List: $28.00Save $2.01
$25.99

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OP Bucks$0.79

Product Info for FAB Defense Glock 42 4-Round Magazine Extension

Pistol Magazine Extensions are the perfect way to extend your shooting capabilities with firearms that have low capacities from the factory, and the FAB Defense Glock 42 4-Round Magazine Extension is the perfect attachment for your Glock 42. The FAB Defense Glock 42 4-Round Magazine Extension works by replacing the floor plate in your standard Glock 42 magazine to add 4 extra rounds of capacity, bringing the total to 10 rounds in a magazine. If you plan to daily carry your Glock 42, pick up the FAB Defense Glock 42 4-Round Magazine Extension today.image

Specifications for FAB Defense Glock 42 4-Round Magazine Extension:

Manufacturer: FAB Defense
Color: Black
Magazine Capacity: 4 Round
Gun Make: Glock
Gun Model: Glock 42

Features of FAB Defense Glock 42 4-Round Magazine Extension:

  • Glock 42 only
  • Enables a full grip on the handgun
  • Contoured finger indents for a firm grip during magazine manipulation
  • Innovative spring plate allows the use of the original magazine spring
  • Fiberglass reinforced polymer construction
  • Weighs 37 grams

Package Contents:

  • FAB Defense Glock 42 4-Round Magazine Extension

FAB Defense Glock 42 4-Round Magazine Extension Orderable Models

List of Orderable Models

  • FAB Defense Glock 42 4-Round Magazine Extension, Black, FX-4210B , MPN: FX-4210B , UPC: 7290111585005 , Code: 1S0-PME-FDG42RM-FX-4210B-4RD
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