SLR B56 Billet 300 BLK with Noveske 10.5-inch Barrel
$2,068.016 parts
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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.
What Is a Red Dot Sight? How It Works, MOA Sizes and Zeroing
A red dot is a non-magnified sight that puts an LED aiming dot on target. How it works, dot sizes in inches, and zeroing.
Billet vs Forged Lower Receivers: The Real Differences
Forged lowers are pressed then machined; billet lowers are cut from solid. What that changes, and what doesn't.
ALG ACT Trigger Review: Specs, Pull and How It Compares
A coated mil-spec style trigger at about 6 lb: what ALG says the ACT does, how it differs from the QMS, and today's prices.