SLR B56 Billet 300 BLK with Noveske 10.5-inch Barrel
$2,068.016 parts
Build your own AR-15
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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.
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8.2-inch 300 BLK on a BCM Upper and Geissele DDC Lower
$1,353.935 parts
Aero 10.5-inch Folder with FN Barrel and Geissele MK14
$2,451.8712 parts
Block II-Style DD M4A1 14.5-inch on an Aero M4E1 Lower
$2,287.458 parts
Parts builders pick most
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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
MOE K2 Grip Polymer Black
$14.99 at GunMag Warehouse · 9 stores
In stock
H1 Super 42 Braided Wire Buffer Spring And Buffer Combo, H2
$108.99 at Kentucky Gun Co · 8 stores
In stock
B5 Systems SOPMOD Bravo Stock - Black BRV-201-01
$54.19 at Palmetto State Armory
From the blog
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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.
Extended and Ambidextrous AR-15 Magazine Releases (Live Prices)
Bigger buttons, swappable pads or a left-side paddle: AR-15 magazine release upgrades compared, with prices.
DPMS vs ArmaLite Pattern AR-10: What Fits What
Receivers, barrels, barrel nuts and some magazines are pattern-specific; small parts usually swap. What fits what, with prices.
AR-15 Safety Selector Detent and Spring: How to Install Them (and Not Lose Them)
The safety detent rides on the selector and the spring sits in the grip. Install order, troubleshooting and spare parts.