AR-15 Builder
Over 1 million parts configured since 2020
Build an AR-15 part by part and price it in real time. Pick a lower receiver, upper, barrel, handguard, bolt carrier group, trigger and optic. GunPartPicker checks compatibility as you go and compares live prices across 35+ retailers so you can see what the full build costs before you buy.
Not sure where to start? The AR Build Cost Calculator fills every slot with the part builders add most, in stock, and prices the whole build.
Choose a part to start your build
Build an AR-15, AR-10 or AR-9
AR-10 Builder
.308, 7.62 NATO or 6.5 Creedmoor on a large frame lower. The builder flags small frame parts that will not fit.
AR-9 Builder
9mm pistol or carbine. The builder flags 5.56 barrels and bolts that will not run, and prices the blowback parts across every store we track.
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