Armaspec LPK STS Lower Parts Kit for AR-15 – .223/5.56 (Black)

The Armaspec LPK STS (Lower Parts Kit with Silent Trigger Spring) is a complete lower parts kit for AR-15 platform rifles chambered in .223/5.56. This kit includes all the small parts needed to complete a stripped AR-15 lower receiver, featuring Armaspec's sound-dampening trigger spring technology that reduces the metallic ping common with standard trigger springs. Whether you're building a new rifle or replacing worn components, this kit provides quality internals for reliable function.

Constructed with mil-spec dimensions and a black finish, the LPK STS is a drop-in installation for builders with basic armorer skills and standard tools (punch set, hammer, and bench block recommended). The kit includes trigger, hammer, disconnector, springs, pins, and all necessary detents—everything except the pistol grip and trigger guard, which are typically chosen separately to match the builder's preferences.

• Part Type: Complete Lower Parts Kit (minus grip and trigger guard)
• Compatible Firearms: AR-15 platform rifles (.223/5.56)
• Material: Steel components, mil-spec dimensions
• Finish: Black
• Installation: Drop-in with standard armorer tools
• Includes: Trigger assembly, hammer assembly, disconnector, all springs, pins, and detents (excludes pistol grip and trigger guard)