F.A.B. M4-G3 FK

M4 Collapsible Buttstock System for H&K G3

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


  • Provides optimal eye to target alignment
  • Made from  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 for reduces slipping
  • Intergraded storage compartment for 2x CR123 / AA batteries
  • Available in black, olive drab green, or desert tan


  • H&K G3 and variants

You can buy directly

visit our U.S. website


Weight494 gr
Width45 mm
Height150 mm
Length240 mm
Length (open / deployed)315 mm
LOP min375 mm
LOP max450 mm


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