Strike Industries AR-15 Lower Receiver Spring Gunsmith Kit, 9-Piece

The Strike Industries AR-15 Lower Spring Gunsmith Kit (brand part number SI-AR-LRSK-PRO) bundles the nine springs most commonly replaced or accidentally lost when building or servicing a stripped AR-15 lower receiver. The kit covers the bolt catch, disconnector, buffer retainer, trigger, hammer, magazine catch, and selector springs, along with two detent springs, so you’re not stuck hunting down a single part number mid-build. Keeping fresh springs in a lower receiver matters for reliable function, and this kit makes it easy to rebuild a used lower or finish a fresh build without piecing together springs from multiple sources.

Key Specifications

• Includes 9 springs total in one kit.
• Covers the bolt catch spring.
• Includes the disconnector spring.
• Includes the buffer retainer spring.
• Includes the trigger and hammer springs.
• Includes the magazine catch spring.
• Includes the selector spring.
• Includes two detent springs.

Frequently Asked Questions

Will this kit cover a full lower receiver build? It covers the 9 springs most commonly needed or lost during a lower build, including trigger, hammer, and selector springs.

Is this a good kit for rebuilding a used lower? Yes, it’s designed for exactly that — replacing worn or missing springs during a rebuild or fresh build.

Buy the Strike Industries AR-15 Lower Receiver Spring Gunsmith Kit, 9-Piece

Stock up on every spring your lower build needs. Order from our Strike Industries lineup of AR lower parts from a Lubbock, TX gun shop.