A single recommended budget AR-15 build, part by part, with a running cost tally that lands under $700. Optimized for the lowest reliable price, not the lowest possible. Load the exact build in our custom AR-15 builder.
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This is one opinionated budget AR-15 build, sourced part by part, with a running cost total that lands under $700. It is optimized for the lowest reliable price, not the lowest possible price. Every line item is a part that runs, from a tested PSA 16-inch nitride barrel to a properly staked bolt carrier group. If you want bundled kits ranked by tier instead, see the AR-15 build kits guide. If you need the step-by-step assembly walkthrough, the build-your-first-AR guide covers the wrench work.
Spend on the barrel and bolt carrier group, save on the furniture, and never buy a no-name version of either. A budget AR-15 fails in exactly two places: an over-gassed or untested barrel, and a BCG with an unstaked gas key. Get those two right and the rest of the rifle is just cost management. The base build below lands at $602 on the complete-upper path, running the mil-spec trigger that ships in the lower parts kit, and the one upgrade worth adding, the ALG ACT trigger, brings the whole rifle to $690 and still under the $700 line.
The order of spending matters more than the brand names. Magazines are the highest-return purchase you can make and the cheapest, so buy several PMAGs first. The barrel and BCG are the reliability floor. The trigger is the single biggest feel upgrade per dollar. Everything else, the stock, grip, charging handle, and sights, can start basic and improve later without affecting whether the rifle runs.
There are two ways to build the front half of this rifle, and the choice decides whether you buy a separate BCG and charging handle. The complete-upper path is cheaper and simpler. The part-by-part path gives you control over every component. Do not double-count: the PSA complete upper config frequently ships with a BCG and charging handle already installed, so adding the Toolcraft BCG and BCM handle on top is for the bare-upper path only.
Buy the PSA 16-inch nitride complete upper with the BCG and charging handle included (around $290). You skip sourcing a separate BCG and handle, the upper is headspaced and ready, and you bolt it to a finished lower. Fewer boxes, fewer decisions, and the carrier that ships with it runs. This is the path the builder preset loads.
Buy the bare 16-inch nitride upper (around $130-150), then add the Toolcraft nitride BCG (around $85) and BCM Gunfighter charging handle ($75). You pick the carrier coating and the latch you want, and you end up with a known, staked BCG instead of whatever ships in the complete config. It costs about $10 more and takes a little longer.
For a first budget build, take the complete-upper path and put the saved money toward more magazines and ammunition. The part-by-part path is the right call if you already know you want a specific BCG coating or you are building several rifles and want consistent parts across them. For a deeper look at barrels specifically, the AR-15 barrel guide breaks down profiles and gas systems beyond the nitride barrel used here.
Eleven parts build one reliable 16-inch AR-15. Each pick is the lowest-cost version that still runs, ordered the way you would assemble the rifle from the lower up.
The foundation: a forged 7075-T6 mil-spec lower for the price of a parts bin
Every pin, spring, and detent to finish the lower, organized so you don't lose a detent
The single most important assembly: a tested 16" nitride barrel that punches above its price
Don't-cheap-out item #1: an MPI-inspected, properly staked BCG that runs for years
The one furniture upgrade worth doing on day one: forces load off the roll pin
Complete recoil system: 6-position mil-spec tube, carbine buffer, spring, castle nut, end plate
A stock that doesn't rattle, with a built-in QD point, for budget money
The cheapest worthwhile upgrade: fixes everything the A2 grip gets wrong
The biggest single feel upgrade: Geissele-family quality at a third the SSA price
Iron sights that work and weigh nothing, so the build is shootable before you buy an optic
The mag that ends the conversation: industry-standard reliability for the price of a sandwich
The stripped lower receiver is the serialized firearm and ships to an FFL for a background check. Every other part ships to your door. A 16-inch barrel keeps the rifle out of NFA territory.
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Street prices, not big-box markup. The complete-upper path is the honest under-$700 total because the upper already carries the BCG and charging handle, so you do not pay for those twice. The part-by-part column shows the cost of the bare upper plus a separate Toolcraft BCG and BCM handle for builders who want that control. Both base totals run the mil-spec trigger from the lower parts kit; the ALG ACT is broken out as the single recommended add-on.
| Part | Pick | Complete-Upper Path | Part-by-Part Path |
|---|---|---|---|
| Stripped lower | PSA Stealth | $60 | $60 |
| Lower parts kit | CMMG LPK | $37 | $37 |
| Upper | PSA 16" nitride | $290 (with BCG + CH) | $140 (bare) |
| Bolt carrier group | Toolcraft nitride | included | $85 |
| Charging handle | BCM Gunfighter | included | $75 |
| Buffer tube kit | Mil-spec carbine | $45 | $45 |
| Stock | Magpul MOE SL | $55 | $55 |
| Grip | Magpul MOE | $21 | $21 |
| Backup sights | Magpul MBUS Gen 2 | $80 | $80 |
| Magazine | PMAG 30 GEN M3 | $14 | $14 |
| Base total | Mil-spec trigger from LPK | $602 | $612 |
| Trigger upgrade | ALG ACT (optional) | +$88 | +$88 |
| Total with ALG ACT | The one upgrade worth adding | $690 | $700 |
Street prices, checked June 2026; sales routinely drop these further, and the Stealth lower lands closer to $50 when PSA runs it in a multipack. The base build runs the mil-spec trigger that ships in the CMMG kit, so the complete-upper path lands at $602 and the part-by-part path at $612, both comfortably under $700. The ALG ACT is the one upgrade worth adding: at $88 it changes how the rifle feels more than any other part at this price, and it still leaves you at $690 to $700 all in. To swap parts and see live totals, load the exact build in the custom AR-15 builder.
The core assemblies above, the PSA nitride upper, stripped lower, and BCG, are the fixed picks of this build. The widget below lets you set the parts that are genuinely a choice: the ALG ACT trigger, BCM charging handle, MOE SL stock, MOE grip, and a PMAG. Swap any of them to compare price and weight. To configure the full rifle including the complete-upper path, open the custom AR-15 builder.
Base Platform
Custom / $1100.00 base
Blank-slate AR-15 platform for selecting every upper, lower, and core component.
Upgrade Builder
Open any slot to add an upgrade; the total updates in place and every part keeps its tracked retailer link.
Pull weight, reset, and feel for precision shooting.
No upgrade selected for this slot.
Improves manipulation under optics and with gloves.
No upgrade selected for this slot.
Dial in length of pull, cheek weld, and balance.
No upgrade selected for this slot.
Ergonomic control surface for trigger hand.
No upgrade selected for this slot.
Ambi control with configurable throw and lever shape.
No upgrade selected for this slot.
Feed reliability and capacity, especially with duty mags.
No upgrade selected for this slot.
The lower parts kit is its own quiet trap. Cheap kits use weak detent springs that let the safety selector and takedown pins walk out under recoil. The CMMG kit uses properly spec'd springs; if you want to compare lower parts kits in depth, the lower parts quality guide ranks them by spring and detent reliability.
Magazines are the highest-return, do-it-first purchase on the whole build. Buy at least six to ten before you spend on anything else, because a rifle with two mags is a range toy and a rifle with ten is a working gun. PMAG 30 GEN M3s run $13-17 each, survive drops, and feed every STANAG-pattern AR. There is no reason to ration here.
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The MBUS sights make the rifle shootable on day one, but a red dot is the upgrade that changes how fast you can use it. Budget red dots in the $100-200 band now hold zero and survive recoil in a way they did not five years ago. Once the build runs, the budget red dot guide covers the picks worth co-witnessing with these irons.
Avid shooter with 9+ years of experience including competition shooting. Built 10+ AR-pattern rifles and several handgun platforms for home defense, competition, and suppressed night shooting.
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