Description
The Magpul ACS (Adaptable Carbine/Storage) Mil-Spec is a drop-in stock for AR15/M4 and AR10/SR25/M110 carbines running Mil-Spec receiver extension tubes. It adds storage without a bulky profile: two water-resistant tubes along the cheek weld hold up to three CR123A or AA batteries each, and a latching door on the right side opens a further storage bay near the butt-pad. The lengthened, widened cheek weld, ambidextrous shielded release latch and supplemental friction lock give a solid, rattle-free mount, with a chrome-silicon lock spring and anti-slip rubber butt-pad. A reversible QD sling cup and footman’s loop are included. Specifications from Magpul: 13.7 oz stock only (about 17.5 oz with tube), 7.9 in long, 5.2 in high, 2.6 in wide, 3.3 in of LOP adjustment (about 11.3 in collapsed to 14.6 in extended). Choose Black or Flat Dark Earth.
Key features
- Two water-resistant battery storage tubes (three CR123A or AA each) plus a latching storage bay near the butt-pad
- Lengthened, widened cheek weld; ambidextrous shielded release latch
- Supplemental friction-lock system for a tight, quiet fit on the tube; chrome-silicon lock spring
- Weight 13.7 oz stock only (~17.5 oz with receiver extension); length 7.9 in, height 5.2 in, width 2.6 in, butt 1.7 in
- Length of pull ~11.3 in collapsed / ~14.6 in extended (3.3 in range)
- Reversible QD sling cup and footman’s loop included; anti-slip rubber butt-pad
- Fits Mil-Spec carbine receiver extensions; Magpul code MAG370; made in the USA
Specifications from Magpul (magpul.com).
Firearm parts and accessories are supplied by 3 Gun Tactical, Licensed Firearms Dealer 50001578, Tingalpa QLD. Check your state’s firearm-parts and magazine rules before ordering.








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