UTG Pro RBUS3BM Mil-Spec OPS Ready S3 Stock Kit Black 6-Position AR-15, M16

The UTG Pro RBUS3BM OPS Ready S3 Mil-Spec Stock Kit is a heavy-duty, drop-in buttstock assembly purpose-built for AR-15 and M16 pattern rifles. Proudly designed and made in the USA, the S3 is built around a polymer stock body mated to a mil-spec aluminum receiver extension tube, giving shooters a lightweight yet rugged upgrade for carbine, rifle, and pistol-length AR platforms.

The S3 stock features a 6-position adjustable length-of-pull and a unique sub-compact 6.05" profile that keeps the rear of the rifle close to the shooter for improved handling. The compact design complements UTG Pro's Super Slim handguard lineup for a clean overall build.

Manufactured to tight tolerance controls for a secure fit, this complete kit ships ready to install on any mil-spec AR-15 or M16 receiver extension. Included in the box:

• Polymer OPS Ready S3 buttstock
• Mil-spec 6-position aluminum receiver extension tube
• Buffer
• Buffer spring
• Tear-drop receiver ring
• Castle nut

Finished in black, the OPS Ready S3 is a turnkey replacement or upgrade stock for any mil-spec AR-15 or M16 carbine.