How to Choose an AR-15 Stock: Fixed vs Adjustable
Woody's answers are based on published federal and state law. Not legal advice. Consult a licensed attorney for your specific situation.
Choose adjustable stocks for multiple users or tactical applications requiring length adjustment. Choose fixed stocks for lightweight builds, competition, or when consistent cheek weld matters more than adjustability.
How This Affects Your Build
Stock choice significantly impacts your rifle's balance, weight, and fit to different shooters. Fixed stocks offer simplicity and weight savings while adjustable stocks provide versatility for multiple users or varying gear configurations. The decision affects both the rifle's handling characteristics and compliance with local regulations.
The Detail
Fixed stocks eliminate moving parts and potential points of failure while typically weighing less than their adjustable counterparts. They provide a consistent length of pull and cheek weld position, which benefits precision shooting and competition applications where repeatability matters. Fixed stocks also tend to have fewer regulatory complications in restricted jurisdictions.
Adjustable stocks allow you to modify length of pull to accommodate different shooters, seasonal clothing changes, or body armor. Most adjustable stocks use a spring-loaded mechanism with multiple locking positions, typically ranging from around 10.5 to 14 inches of length of pull. This versatility makes them popular for tactical applications and family rifles.
Weight differences between fixed and adjustable stocks typically range from a few ounces to nearly a pound depending on materials and design. Adjustable stocks generally add complexity with their internal mechanisms, but modern designs are quite reliable when properly maintained. Some adjustable stocks also offer cheek riser adjustments for optic compatibility.
Consider your primary use case when choosing. Competition shooters often prefer fixed stocks for their consistency, while home defense or multi-user rifles benefit from adjustability. Training frequency also matters since adjustable stocks let you accommodate different shooting positions and gear configurations more easily.
Build Impact
Your stock choice directly affects rifle balance and handling, with fixed stocks typically moving the center of gravity rearward compared to collapsed adjustable stocks. This decision also influences your buffer tube selection, as some fixed stocks require rifle-length tubes while most adjustable stocks use carbine-length systems.