First Build: Geissele Upper on an ADM UIC Ambi Lower with OCL Polonium K
$2,160.3714 parts
Build your own AR-15
part by part
Pick a part for each slot in our free AR-15 builder, check that it all fits, and see the best price across stores for every part.
- Compatibility checks as you go
- Store prices checked nightly
- Save and share your part list
Shop by part
Latest builds
All completed builds
BCM 14.5-inch SOCOM Upper with DD RIS II on an LMT MARS-L Lower
$4,067.4214 parts
PSA 14.5-inch Quad Rail on an FDE Aero M4E1 Lower
$707.625 parts
BCM MK2 ELW 14.5-inch on a Radical Firearms Lower
$2,003.538 parts
Parts builders pick most
Start a build
Geissele Super Semi-Automatic Enhanced (SSA-E) Trigger- 05-160
$245.00 at Brownells · 8 stores
In stock
Aero Precision AR-15 M4E1 Stripped Lower Receiver - Black
$124.99 at Aero Precision · 2 stores
M16 Bolt Carrier Group Black
$211.26 at Brownells · 6 stores
In stock
AR-15 Talon Safety Selector Ambidextrous Black
$64.95 at Brownells · 7 stores
In stock
AR-15 Raptor Ambidextrous Charging Handle Black
$104.95 at Brownells · 8 stores
In stock
H1 Super 42 Braided Wire Buffer Spring And Buffer Combo, H2
$108.99 at Kentucky Gun Co · 8 stores
In stock
MOE K2 Grip Polymer Black
$14.99 at GunMag Warehouse · 9 stores
In stock
B5 Systems SOPMOD Bravo Stock - Black BRV-201-01
$54.19 at Palmetto State Armory
From the blog
All posts
How to Build an AR-15: Parts List, Tools & Steps
Everything you need to build an AR-15: parts list with current prices, tools, and step-by-step photos for the lower and upper receiver.
Chrome-Lined vs Nitride vs Stainless AR-15 Barrels (Live Prices)
Chrome-lined, QPQ nitride or stainless: what each AR-15 barrel treatment is, what makers claim, and live prices.
AR-15 Buffer Tube Types: Carbine, Rifle, A5 and Pistol (Live Prices)
Carbine, rifle, A5 or pistol buffer tube? What each type is, which stock and buffer go with it, and why you cannot mix them.
Lightest AR-15 Stocks and Skeleton Stocks (Live Prices)
The lightest AR-15 stocks by maker weight, from the 5.8 oz Battlelink Minimalist to skeleton fixed stocks, with live prices.