Tariffs on aluminum and steel hit 34% in July 2026. That means your AR upper receiver just got $40-60 more expensive. Your barrel? Expect to pay $15-25 extra. If you're building an AR-15 this year, you're building in a different market than 2025, and pretending otherwise is stupid.
I've built five ARs since 2010. Three of them started as poverty builds—parts sourced from whoever had stock and decent prices. The other two I did right. I'm going to walk you through what actually matters, what's getting hammered by tariffs, and where you can save without compromising reliability.
The Parts That Matter—And Cost Real Money
An AR-15 isn't magic. It's a piston-and-spring system that works because Stoner figured it out in 1956. You don't need boutique parts for a rifle that runs. You need good metallurgy, tight tolerances, and honest manufacturing.
Your bolt carrier group (BCG) is non-negotiable. This is where tariffs hurt most. A quality MPI-tested BCG from Toolcraft or Sionics runs $140-180 now—up from $110-140 a year ago. That's the tariff hit directly. Don't cheap out here. A carrier that headspaces wrong or a bolt that's out-of-spec will eventually cost you more than the $40 you saved. Palmetto State Armory and Brownells still stock reliable options, but expect backordered status through September.
The barrel. This is where I see people make mistakes. You don't need a $300 match-grade barrel for a fighting rifle. A $120-160 Faxon or BA barrel in 1:7 twist handles everything from 55-grain varmint loads to 77-grain match ammo. Both companies manufacture in the US, so tariff impact is minimal compared to imports. Chamber and bore are quality-controlled. That's enough. Faxon's 16-inch cold-hammer-forged runs about $145 right now—reasonable for what you get.
Upper and lower receivers are both affected by tariffs. An 80% lower (still legal in most states) lets you avoid the FFL transfer entirely, but building from an 80 requires a drill press or jig and time. A complete lower—trigger, stock, buffer tube, everything—costs $160-220 depending on the brand. Aero Precision lowers are solid and hold value. Strike Industries makes good stuff too. The aluminum tariffs mean pricing is tighter than it was, so shop now if you're building.
What to Actually Skip (And Why)
BCM Gunfighter charging handles, Magpul grips, adjustable gas blocks, and ambidextrous safeties. These aren't bad. They're useful. But they're not essential for a rifle that works. If you're building your first AR and you're cost-conscious, skip them.
Adjustable gas blocks are popular right now. They let you tune your gun to specific ammunition or keep pressure down on a suppressed setup. They cost $80-120. If you're shooting a standard 16-inch barrel with standard ammunition, a properly sized standard gas block does the same job for $20. Add the adjustable one later if you need it. You probably won't.
Ambi safeties run $40-60. A standard safety selector costs $8. It works the same on a right-handed shooter. Again—nice to have, not necessary. The money goes further spent on training or ammunition.
That $200 optic on sale. I know the temptation. A decent LPVO (low-power variable optic) from Vortex or Primary Arms costs $300-500 and actually holds zero. A budget optic from an off-brand with "tactical" in the name will drift or fail. Wait. Save another month. Buy the Vortex Diamondback 1-6x or the Primary Arms SLx 1-6x ACSS. Both are repeatable, tough, and won't lose zero after 500 rounds.
The Build That Actually Works Right Now
Here's a realistic 2026 build list. Ground-floor pricing includes current tariff pressures:
- Lower receiver and parts: Aero Precision M4E1 lower ($130) + PSA lower parts kit ($40) + B5 Systems stock ($70) = $240
- Upper receiver: Aero Precision M4E1 stripped upper ($100)
- Barrel: Faxon 16" 1:7 barrel ($145)
- Bolt carrier group: Toolcraft MPI-tested BCG ($165)
- Gas system: Standard midlength tube and front sight ($35)
- Handguard: Magpul MOE SL free-float ($65)
- Charging handle: Standard ($12)
- Fire control: Smooth two-stage trigger from Rise or ALG ($55)
- Muzzle device: A2 flash hider ($10) or Surefire MB ($40)
Total: roughly $820-850. This rifle works. It'll run 1000 rounds without a hiccup. Add $300 for a decent optic, $200 for magazines and a sling, and you're at $1350 all-in for a rifle that actually runs.
Compare that to a complete rifle from Daniel Defense or LMT—$1400-1800 depending on config. You're not saving much by building, but you understand every part in your gun. That knowledge matters when something goes wrong or you need to diagnose an issue.
The Tariff Trap and Inventory Right Now
Distributors stockpiled before the July tariff increase. What's in stock now is mostly older inventory at pre-tariff prices. By October, that clears out. Second-wave inventory comes in at higher cost, and retail prices will climb another 8-12%. If you're building, buy receivers and barrels now. The $35-40 savings per part adds up.
Foreign uppers and lowers from Radian, Noveske, and others have 30-45 day lead times. US-made Aero, Strike, and Mega uppers are shipping within a week. That's not coincidence—international shipping and tariff delays are real.
Ammunition is stable right now. 5.56 NATO runs $0.28-0.35 per round in bulk. That's not impacted by tariffs the same way parts are. Buy quality ammo now—Federal Fusion, Hornady Match, or even basic ball ammo from Lake City. Test your build with it before you worry about fancy loads.
Assembly and What You Actually Need to Know
You need a punch set ($15), a torque wrench ($35), and some gun oil. That's it. Assembly takes two hours if you're careful. Watch a Garand Thumb or Honest Outlaw video—don't read forum threads written by people who've never actually built anything.
Headspace is not an issue if you buy a new barrel and BCG. Worry about headspace if you're mixing old surplus parts. New stuff is headspaced correctly at the factory.
Your first round through your new build is a real moment. Make sure you do it at an actual range with a trained eye nearby. If you've never shot an AR, find someone who has. Safety first, ego nowhere.
After 500 rounds, you'll know if something's wrong. Most builds run clean from round one. When they don't, it's usually a gas block that's too tight or an underpowered load. Neither is a disaster.
DJ Cavalcanti founded DownRange on a simple idea: the Second Amendment community deserves better information. He built the platform to make firearms news, state gun laws, legal developments, and market intelligence freely available to every gun owner — in one place, updated constantly.