The Spike’s Tactical Spider complete lower receiver with an M4 stock (brand part no. STLC200-SBS-CFS) ships fully assembled, inspected and tested, so it mates directly with a rifle upper without a separate parts kit, buffer or stock. Spike’s forges the receiver from 7075 T6 aluminum, finishes it to MIL-A-8625F Type III Class 2 hard coat anodize and marks it with the Spider logo and a bullet pictogram selector. The lower is low-shelf and RDIAS compatible, and it runs a 6-position mil-spec buffer tube with a castle nut and staked latch plate. A Spike’s M4 stock adjusts for length of pull, and the parts kit adds a jeweled mil-spec trigger and a billet magazine release. For a builder who wants a finished lower from a respected AR maker, this Spike’s Tactical lower is ready as soon as it meets an upper.

Key Specifications

• The lower ships fully assembled and complete, ready to mate with a rifle upper.
• The receiver is a 7075 T6 forging, chosen for strength at a light weight.
• The finish is MIL-A-8625F Type III Class 2 hard coat anodize for wear resistance.
• The lower is multi-caliber compatible with standard AR-15 uppers and bolt groups.
• It is low-shelf and RDIAS compatible, which widens the choice of uppers and parts.
• The stock is a Spike’s Tactical M4-style adjustable stock that adjusts for length of pull.
• The buffer tube is a 6-position mil-spec tube with a castle nut and a staked latch plate.
• The buffer system pairs a Spike’s ST-T2 buffer with a 17-7 stainless spring for smooth cycling.
• The parts kit includes a jeweled mil-spec trigger for a familiar single-stage feel.
• The magazine release is a billet magazine release button for a positive drop.

Frequently Asked Questions

Does this lower ship complete or stripped? It ships complete and fully assembled, with an M4 stock installed.

Is the stock adjustable? Yes. The M4-style stock adjusts for length of pull on a 6-position mil-spec buffer tube.

Do I still need a lower parts kit? No. The lower is fully assembled, so it only needs an upper to become a rifle or pistol build.

Buy the Spike’s Tactical Spider Complete Lower Receiver, M4 Stock

A fully assembled lower with an adjustable M4 stock lets you skip the parts-kit build step and put the time into the upper. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL, and see more AR-15 lowers while you are here.