Features

• Mounts on mil-spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others (please see the note below)
• Two water-resistant battery storage tubes located on the left and right sides of the stock
  
  • Each tube will store up to two (2) CR123A lithium or AA batteries
  • Tubes are accessible from the rear in any stock position via a hand-removable rubber plug
• Supplemental friction lock minimizes accuracy robbing wobble*
• Premium chrome-silicon lock spring provides positive locking and long service life
• Sloping cheek weld provides a wide contact surface for user comfort
• Shielded release latch prevents snagging and accidental operation
• Replaceable 0.30" Rubber Butt-Pad offers an anti-slip surface and increases impact protection
• Compatible with Magpul ASAP® and other receiver-mount sling attachments
• Sling Mounts
  
  • Rear – Reversible Type 1 Sling Mount fits up to 1.5" push-button QD swivels (swivel not included)
  • Rear/Bottom – 1.25" sling loops

Optional Accessories**

• Extended Rubber Butt-Pad, 0.55"
• Enhanced Rubber Butt-Pad, 0.70"
• Dual-side push-button QD swivel Type 2 Sling Mount

Specifications**

• STR, Mil-Spec (stock configuration)
  
  • Weight: 0.77 lb.
  • Weight, w/ Rec. Extension: 1.02 lb.
  • Length, Maximum: 7.30 in.
  • Width, Maximum: 2.58 in.
  • LOP Adjustment Range: 3.25 in.
  • LOP, M4 Collapsed: 11.10 in.
  • LOP, M4 Extended: 14.35 in.

NOTE: There are two basic sizes of M4 Carbine receiver extensions (buffer tubes): mil-spec and commercial-spec. If you have a commercial-spec extension on your rifle, make sure to order the Commercial-Spec STR. Please see the "Related Info" section above to determine which tube you have. 


* Friction lock performance may vary depending on the host receiver extension's dimensional tolerances.

** Specifications based on standard-length (flat-back) M4 Carbine receiver extension and may vary depending on tube manufacturer.
Standard Rubber Butt-Pad, 0.30" weight: 0.08 lb. Optional Extended Rubber Butt-Pad, 0.55" (weight: 0.11 lb.) or Enhanced Butt-Pad, 0.70" (weight: 0.13 lb.) may be used with either Mil-Spec or Commercial-Spec STR stocks.