Blackhawk Knoxx Stock M4 Collapsible AR-15, LR-308 Carbine Synthetic

Product Family #: 2157216506
Please Sign In or Create an Account to use this feature.
  • Information
This BLACKHAWK! Knoxx M4-Style Collapsible Stock is constructed of high impact, glass-reinforced polymer, and is an excellent way to increase the versatility of an AR-15 carbine due to its ability to instantly adjust the length of pull to fit different users or circumstances. While the stock's design closely follows the lines and general appearance of the US military's M4 Carbine buttstock, several subtle improvements have been integrated to enhance its overall functionality. These include a more substantial comb for a comfortable cheek weld and reduced neck fatigue, a pair of side-mounted, quick detach sling swivel sockets, a recessed stock adjustment latch, and a bottom-mounted, fixed sling swivel stud located at the toe. This stock is compatible with AR-15 and SR-25 / LR-308 type carbines that are equipped with a multi-position receiver extension buffer tube (sold separately).

Technical Information:
  • AR-15 Carbine Receiver Extension Tubes (AKA Buffer Tubes) come in 2 different varieties: Commercial Diameter and Mil-Spec Diameter. To determine which tube size you have, measure the outside diameter of the tube's rounded top section from the sides at its widest point. A Commercial tube will be approximately 1.168" in diameter, while a Mil-Spec tube will be approximately 1.148" in diameter.

  • In order for your collapsible stock to fit and function as designed, it must be installed on a receiver extension tube of the correct diameter.

  • Was this information helpful? Yes No

    Thank you! Your valuable feedback helps improve our product information and offering.

    Help Us Improve

    Please enter the missing required fields:

      Do you accept our terms and conditions? *
      Know someone who may like this? Email this Page to a Friend

      Customer Reviews

      The statements and opinions expressed within Customer Reviews reflect each author's personal perspective and do not imply endorsement by MidwayUSA, its Employees or any other organization. Customers should in no way infer that MidwayUSA has validated review information as safe, accurate or appropriate.

      NOTE: Prices, specifications and availability are subject to change without notice. We reserve the right to correct typographic, photographic and/or descriptive errors.