Magpul MOE Milspec Collapsible Stock
Magpul MOE Milspec Collapsible Stock

Magpul MOE Milspec Collapsible Stock

Part Number:MAG400
Your Price: $39.95
In Stock.

Choose Options

1.25" Quick Detach QD Sling Swivel [+$8.95]
5.56 Milspec 6 Position Tube Kit [+$29.95]
.308 Milspec 6 Position Tube Kit [+$32.95]
9MM Milspec 6 Position Tube Kit [+$48.95]
5.56 VLTOR RE-A5 Milspec Tube Kit [+$92.95]
Add MAG317 Enhanced Buttpad [+$15.95]
Add Carbine Tool [+$6.00]

MOE Milspec Carbine Stock

MOE™ M4 Carbine Collapsible Butt-Stock – Mil-Spec MAG400

Magpul® Original Equipment (MOE™) is a line of firearm accessories designed to provide a high-quality, economical alternative to standard weapon parts. The MOE™ line distinguishes itself with a simplified feature set, but maintains Magpul engineering and material quality.


The Magpul® MOE™ Stock – Model is a drop-in replacement butt-stock for  AR-15 carbines (Select MAG400 FOR MILSPEC 1.14" DIAMETER TUBES OR our MAG401 FOR COMMERCIAL 1.17" DIAMETER receiver extension tubes). Designed for light, fast action the streamlined A-frame profile avoids snagging and shields the release latch to prevent accidental activation. The extra-power lock mechanism uses a premium chrome-silicon spring to avert auto-collapse failure and maintains strength by resisting spring relaxation. BOTH Models include an extended 0.55” rubber butt-pad to provide positive shoulder purchase and accommodates longer slant-back extension tubes.


Note: There are two basic types of M4 Carbine Receiver Extensions (buffer tubes): Mil-Spec and Commercial. 


Made in USA



  • MAG 401 Mounts on Commercial Carbine Receiver Extension tube (Not included) from manufacturers such as Bushmaster, DPMS, RRA, Olympic, etc.
  • MAG 400 Mounts on Milspec Carbine Receiver Extension tube (Not included) from manufacturers such as Stag, S&W, Colt, etc.
  • Premium chrome-silicon spring provides positive locking and long service life
  • Sloping cheek weld combines a slim profile with user comfort
  • Shielded release latch prevents snagging and accidental operation
  • Side mounting slots accept optional cheek risers for NON-AR15 / M16 applications
  • Compatible with Single-Point® sling mounts
  • Sling Mounts
  • Rear / Bottom - 1.25” Sling loops
  • Toe - Lanyard hole for custom para-cord rigs


Included Accessories*

  • Standard Rubber Butt-Pad


  • MOE Carbine Stock (w/ Rubber Butt-Pad)
  • Weight, Stock: 0.53 lb
  • Weight, w/ Receiver Extension: 0.93 lb
  • Length, Stock: 7.13 in.
  • LOP Adjustment Range: 3.8 in.
  • LOP, M4 Collapsed: 10.7 in.
  • LOP, M4 Extended: 14.5 in.



  • 1) QD Sling Swivel
  • 2) Enhanced Rubber Butt-Pad MAG317
  • 3) Carbine Tube Installation Tool (only tool necessary to change out an AR-15 Lower Receiver Tube)
  • 4) 7 Position VLTOR A5 Tube Kit
  • 5) 6 Position Mil-spec Tube Kit (6 Position Tube, Buffer, Locking Plate, Castle Nut, Carbine Spring)


Related Items

Browse By Category
Browse By Price