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The Magpul MAG378-BLK, also known as the Magpul ACS-L (Adaptable Carbine Stock - Light), serves as an easy-to-install replacement buttstock for AR15/M4 carbines. It is designed to perfectly fit mil-spec sized receiver extension tubes.
An upgraded and sleek version of the ACS, the ACS-L maintains the same center storage compartment along with the cheek weld. In its pursuit of offering a more lightweight and less bulky package, the ACS-L omits the battery tubes. This results in a slimmer, lighter design without compromising the essential features of the stock.