The Spike's Tactical Spider MK4 is a complete .223 Remington and 5.56 NATO lower receiver built in an AR-15 style. It has a black finish, a manual safety selector and a six-position collapsible stock on a mil-spec buffer tube. The package includes an ST-T2 tungsten heavy buffer, so the lower is ready to pair with an upper. It is listed as black and is designed for .223 Remington and 5.56 NATO upper compatibility.

This lower suits a builder putting together a .223 Remington and 5.56 NATO AR-15 style rifle. The adjustable six-position stock lets the shooter set the length of pull, and the tungsten buffer adds weight to the buffer system. Pair it with an upper that matches the chambering you want. The mil-spec buffer tube comes with the lower, so the stock assembly is complete out of the box.

Key features

• Complete AR-15 style lower in black
• Six-position collapsible stock
• Mil-spec buffer tube
• ST-T2 tungsten heavy buffer included
• Manual safety selector

This firearm ships to the licensed FFL dealer you choose, where you complete ATF Form 4473 and pass a NICS background check before you take it home.