NOTE: There are two basic sizes of M4 Carbine receiver extensions (buffer tubes): mil-spec and commercial-spec. If you have a mil-spec extension on your rifle, make sure to order the Mil-Spec CTR. Please see the "Related Info" section above to determine which tube you have. * Friction lock performance may vary depending on the receiver extension's dimensional tolerances. ** Specifications based on extended-length (slant-back) M4 Carbine receiver extension and may vary depending on tube manufacturer. Extended Rubber Butt-Pad, 0.55" weight: 0.11 lb. Optional Rubber Butt-Pad, 0.30" (weight: 0.08 lb.) and Enhanced Rubber Butt-Pad, 0.70" (weight: 0.13 lb.) may ONLY be used with standard-length (flat-back) M4 Carbine receiver extensions.
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