Battl Builders
AR-15 BUILDER·100% FREE·1,287 PARTS TRACKED

Stop guessing.
Start building.

Pick parts by what they do, not by SKU. We flag the gas-system, buffer, and caliber mismatches before checkout — and price your build across every retailer in one window.

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LIVE · BATTL INDEX
updated 14s ago
AVG COMPLETE-BUILD COST
$935+0.0% / 30d
LIVE BUILD FEED
0Builds published
$0.0Tracked across retailers
0Parts cataloged
0Compatibility rules
THE PROCESS

3 steps. One Battl-ready build.

01

Pick your parts

Browse real components by what they do — barrel, gas, trigger, lower. No part numbers to memorize.

02

Flag the conflicts

Gas length, buffer weight, caliber. Battl catches mismatches before you spend money on the wrong part.

03

Pull the trigger

Live prices from real retailers, side by side. Click through to buy. We never touch your order.

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PRICE TRENDS · LAST 30 DAYS

Watch the part you want, before you need it.

Average street prices across every retailer we track. Tag any part to watch it; we'll ping you when it drops.

Optic-43.4%
Avg
$359
Complete Upper Receiver+4.8%
Avg
$1025
Complete Lower Receiver-0.4%
Avg
$466
Iron Sights-6.8%
Avg
$68
Magazine+48.4%
Avg
$92
Lower Receiver+2.2%
Avg
$273
HOT PARTS · WEEK 21

What real builders are saving.

··
PartCategoryWasNowΔRetailersAction
LBE Unlimited AR-15 Bolt Gas Rings - Set of 3ARBGRBolt Small Parts$7.99$1.74-78.2%2
+ Add
Luth-AR Carbine Latch PlateCS-01buffer-plate$9.99$2.44-75.6%2
+ Add
LBE Unlimited A2 AR Pistol GripARGRPPistol Grip$8.49$2.09-75.4%2
+ Add
Connector Lock Pin/Spindle Valve PinMA0207Magazine$4.99$1.31-73.7%2
+ Add
LBE Unlimited AR-15 Carbine Length Buffer SpringARSPRGBuffer Spring$8.99$2.88-68.0%2
+ Add
LBE Unlimited AR-15 .750 Barrel Handguard CapARHCRHandguard / Rail$9.49$3.15-66.8%2
+ Add
KAK Industry AR-15 LPK Pin and Detent KitAR15-KT-16Springs & Small Parts$18.99$6.56-65.5%2
+ Add
Ex Performance Adjustable Mil-Spec Stock For Ar15-Ar308 - Ex Performance Adjustable Mil-Spec Stock For Ar15/Ar308 FdeAT-02012-EStock / Brace$127.99$44.36-65.3%2
+ Add
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CONFLICTS CAUGHT EARLY

Gas length, buffer weight, caliber — flagged before the box arrives.

Most AR-15 mistakes happen at the parts-list stage. Battl runs 23 compatibility rules over your build, every time it changes. If something fights, you'll know — with a one-click fix.

  • Gas system length vs. barrel profile
  • Buffer weight vs. stock
  • Caliber / chamber match
  • Bolt face vs. case head
  • Handguard inner ø vs. gas block
CONFLICT · Gas-system mismatch
Ballistic Adv. 16" Mid-Length Barrel
BCM Carbine-length gas tube
SUGGESTED FIX
Switch to BCM Mid-Length gas tube — same retailer, same shipment, +$2.
BUILD 0x4F·82A — 11.5″ Mk1823/23 rules · 1 warning
YOUR BUILD STARTS HERE

Free. No account. Five minutes.

Pick a starting point. Browse parts. Save your build when you're ready. We never charge you. We never touch your order.

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