The Strike Industries Lower Receiver Spring Kit (Strike Industries part no. SI-AR-LRSK) is a black, 9-piece spring set covering the springs most commonly replaced or lost when building or servicing a stripped AR-15/M4 lower. Strike Industries packages every small spring a lower parts build needs into one kit, so a single misplaced part during assembly doesn’t mean tracking down one tiny spring at a time. It’s a smart addition to any build kit or armorer’s bench, whether you’re finishing a first build or restocking spares after years of use.

Key Specifications

• Built as a 9-piece spring kit for a stripped AR-15/M4 lower.
• Includes the bolt catch spring.
• Includes the disconnector spring.
• Includes the buffer retainer spring.
• Includes the trigger spring.
• Includes the hammer spring.
• Includes the magazine catch spring.
• Includes the selector spring.
• Includes two detent springs.

Frequently Asked Questions

How many springs are included? Nine, covering the bolt catch, disconnector, buffer retainer, trigger, hammer, magazine catch, and selector springs, plus two detent springs.

Why would I need this kit? These are the springs most commonly lost or worn when building or servicing a stripped AR-15/M4 lower.

Will this fit my AR-15 build? Yes, it’s sized for AR-15/M4 platform lowers.

Buy the Strike Industries Lower Receiver Spring Kit

Losing one tiny spring mid-build shouldn’t mean an extra shipping wait, and this Strike Industries kit puts every commonly lost lower spring in one order. Order from our Lubbock, Texas gun shop and it ships fast to your door, along with more small AR-15 parts.