The Spike’s Tactical Gen II billet lower receiver (brand part no. STLB200) is a multi-caliber AR-15 lower machined from 7075-T6 aluminum with weight-saving pockets. Spike’s engineered it to come in close to the weight of a standard forged receiver while keeping strength where it matters, and it carries proprietary ambidextrous controls, a built-in trigger guard and a large flared magazine well. All edges and surfaces are 3D chamfered to reduce snagging, and the pivot and take-down pins are melonite and steel. A KNS Mod ST pin kit, buffer retaining pin and spring, and a Spike’s 90-degree ambidextrous safety are included. It is a Title I firearm for builders who want a billet lower. See more from Spike’s Tactical in AR-15 lowers.

Key Specifications

• The receiver is machined from 7075-T6 billet aluminum with pockets that reduce weight where strength is not needed.
• The finish is MIL-A-8625F Type III Class 2 hard coat anodizing.
• The lower is multi-caliber, so it works across AR-15 pattern builds.
• Controls are proprietary and fully ambidextrous, so the lower works equally well for left- and right-handed shooters.
• A Spike’s 90-degree ambidextrous safety is included, and the lower is also compatible with 45, 57 and 60 degree selectors.
• A KNS Mod ST pin kit is included, with melonite and steel pivot and take-down pins designed around the receiver.
• The magazine well is large and flared to speed up magazine changes.
• All edges and surfaces are 3D chamfered to reduce snagging on gear and clothing.
• The lower has a low shelf, is RDIAS compatible, and has a built-in trigger guard.
• Weight is 10.8 ounces, close to a standard forged receiver.

Frequently Asked Questions

Does it come with a complete parts kit? No. It includes the pin kit, buffer retaining pin and spring and the 90-degree ambidextrous safety. The pistol grip, grip screw, buffer tube, trigger, hammer, disconnect, springs and related parts are not included.

Which safety selectors work with it? Spike’s states it is compatible with 45 degree Bad Ass, 57 degree V7, 60 degree Noveske and all 90 degree safety selectors.

Is it a firearm? Yes. It is the serialized lower receiver, so it ships to your FFL.

Buy the Spike’s Tactical Gen II Billet Lower Receiver

A billet lower is a good foundation for a custom AR-15 when you want ambidextrous controls and clean machining. This one trades the usual heft for pocketed weight savings. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.