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FAB Defense M4 Collapsible Buttstock System Up to 58% Off and Blazin' Deal — 4 models

FAB Defense M4 Collapsible Buttstock System for H&K G3, Olive Drab Green, FX-M4G3FKG
FAB Defense M4 Collapsible Buttstock System for H&K G4, Flat Dark Earth, FX-M4G3FKT
FAB Defense M4 Folding, Collapsible Buttstock for VZ58 (Polymer Joint), Black FX-M4VZP
FAB Defense M4 Collapsible Buttstock System for H&K G3, Olive Drab Green, FX-M4G3FKG
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FAB Defense M4 Collapsible Buttstock System for H&K G3, Olive Drab Green, FX-M4G3FKG
FAB Defense M4 Collapsible Buttstock System for H&K G4, Flat Dark Earth, FX-M4G3FKT
2 of 3 images
FAB Defense M4 Collapsible Buttstock System for H&K G4, Flat Dark Earth, FX-M4G3FKT
FAB Defense M4 Folding, Collapsible Buttstock for VZ58 (Polymer Joint), Black FX-M4VZP
3 of 3 images
FAB Defense M4 Folding, Collapsible Buttstock for VZ58 (Polymer Joint), Black FX-M4VZP

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Questions & Answers
will this fit on a adams arms ar15 5.56 AI Answer

This stock is designed specifically for the Heckler and Koch G3 and CZ Sa vz. 58 rifles, so it will not fit a standard Adams Arms AR-15 without a compatible mounting interface.

by OpticsPlanet AI, September 2, 2026
How does it attatch? Expert Answer

Unfortunately, this product is no longer available. If you are interested in an alternative, you can see the options our Product Experts have picked out on the product page or you can explore your options by going to this link: https://www.opticsplanet.com/gun-parts.html

by Carly R., Gear Expert, September 28, 2018
View All Q&A You Have a Question? Ask!

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Prices have been cut drastically on select models of this product as part of a special offer. These prices are so low that there's no double-dipping with coupons or any additional discounts - sorry about that. This offer won't last long, so don't miss out!
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Product Info for FAB Defense M4 Collapsible Buttstock System

The M4-G3 FK Collapsible Buttstock for the Heckler and Koch G3 is an M4 style collapsible buttstock with 5 optional length positions for enhanced performance and versatility.image

Specifications for FAB Defense M4 Collapsible Buttstock System:

Manufacturer: FAB Defense
Gun Type: Rifle
Fabric/Material: Polymer

Features of FAB Defense M4 Collapsible Buttstock System

  • The M4-G3 FK Collapsible Buttstock for the Heckler and Koch G3 is an M4 style collapsible buttstock with 5 optional length positions for enhanced performance and versatility.
  • Advantages:
  • Provides optimal eye to target alignment
  • Made from 6061 T6 Billet aluminum and fiberglass reinforced polymer composite
  • Replaces the original stock and securely attaches to the G3 back plate
  • Integrated Quick Detach sling swivel connectors on both sides
  • Enhances natural fighting stance and hold on your G3
  • Rubber butt-pad reduces slippage
  • Intergrated storage compartment for 2x CR123 / AA batteries

Package Contents:

  • FAB Defense M4 Collapsible Buttstock System

What firearm models does the manufacturer say FAB Defense M4 Collapsible Buttstock System is compatible with?

The manufacturer says that FAB Defense M4 Collapsible Buttstock System is compatible with CZ Sa vz. 58, Heckler & Koch G3

FAB Defense M4 Collapsible Buttstock System Orderable Models

List of Orderable Models

  • Open Box, Dealer Demo, FAB Defense M4 Folding, Collapsible Buttstock for VZ58, Polymer Joint, Black, FX-M4VZP , MPN: FX-M4VZP-DMO , Code: 1S0-RSC-M4CB-FX-M4VZP-DMO-OB-A
  • FAB Defense M4 Folding, Collapsible Buttstock for VZ58, Polymer Joint, Black, FX-M4VZP , MPN: FX-M4VZP , UPC: 879015004477 , Code: 1S0-RSC-M4CB-FX-M4VZP
  • FAB Defense M4 Collapsible Buttstock System for H&K G3, Olive Drab Green, FX-M4G3FKG , MPN: FX-M4G3FKG , UPC: 7290105947086 , Code: 1S0-RSC-M4CB-FX-M4G3FKG
  • FAB Defense M4 Collapsible Buttstock System for H&K G4, Flat Dark Earth, FX-M4G3FKT , MPN: FX-M4G3FKT , UPC: 7290105947093 , Code: 1S0-RSC-M4CB-FX-M4G3FKT

FAB Defense M4 Collapsible Buttstock System Unavailable & Discontinued Models

List of Unorderable Models

  • Open Box, Dealer Demo, FAB Defense M4 Collapsible Buttstock System for H&K G3, Black, M4G3-FK , MPN: FX-M4G3FK-DMO , Code: 1S0-RSC-M4CB-M4G3-FK-DMO-OB-A
  • FAB Defense M4 Collapsible Buttstock System for H&K G3, Black, M4G3-FK , MPN: FX-M4G3FK , UPC: 7290105942975 , Code: 1S0-RSC-M4CB-M4G3-FK
  • FAB Defense M4 Folding Collapsible Buttstock for Galil AR/SAR, Black, M4-GALILP , MPN: M4-GALILP , UPC: 840103151816 , Code: 1S0-RSC-M4CB-M4-GALILP
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Last updated 2026-10-05 UTC.