Description
The Magpul ACS-L (Adaptable Carbine Stock – Light) Mil-Spec is the slim-profile version of the ACS for AR15/M4 and AR10/SR25/M110 carbines on Mil-Spec receiver extensions. It keeps the built-in storage compartment with latching access door and the sloped cheek weld, but removes the battery tubes for a narrower (2.2 in), lighter (12.4 oz) stock. The ambidextrous shielded release latch and friction-lock system lock it down tight, with a chrome-silicon lock spring and anti-slip rubber butt-pad. A reversible QD sling cup and footman’s loop are included. Length 7.9 in, height 5.2 in, 3.3 in of LOP adjustment (about 11.3 in collapsed to 14.6 in extended). This is the black colourway, MAG378-BLK.
Key features
- Slim-profile ACS: storage compartment with latching door retained, battery tubes removed
- Sloped cheek weld for a solid, repeatable cheek position
- Ambidextrous shielded release latch; friction-lock system reduces wobble; chrome-silicon lock spring
- Weight 12.4 oz stock only (~16.2 oz with receiver extension); length 7.9 in, height 5.2 in, width 2.2 in, butt 1.7 in
- Length of pull ~11.3 in collapsed / ~14.6 in extended (3.3 in range); anti-slip rubber butt-pad
- Reversible QD sling cup and footman’s loop included; fits Mil-Spec carbine receiver extensions
- Magpul code MAG378-BLK; made and engineered in the USA
Specifications from Magpul (magpul.com).
Existing listing note retained: prohibited for sale in NSW & ACT.
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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