Short answer: a complete Micro ARP pistol from Moriarti Armaments typically costs about $530 to $900, a stand-alone Micro ARP upper assembly runs about $180 to $500, and a Micro ARP pistol kit costs about $400 to $600. Where you land in those ranges depends mostly on caliber, barrel length, finish and the brace or buffer system you choose.
The figures below come from the current Micro ARP catalog on moriartiarmaments.com (November 2026). Prices change with promotions and stock, so always check the product page for today's price.
Micro ARP price at a glance
| What you buy | Typical price range | Most common price | What it includes |
|---|---|---|---|
| Complete Micro ARP pistol | $530 - $900 | around $600 - $800 | Complete upper and lower, brace or buffer tube, ready to shoot. Ships to your FFL. |
| Micro ARP upper assembly | $180 - $500 | around $260 - $400 | Complete upper for a lower you already own. Many configurations include BCG and charging handle; check the listing. |
| Micro ARP pistol kit | $400 - $600 | around $430 - $450 | Upper plus the parts you need to finish the build on your own lower. |
What drives the price of a Micro ARP
1. Caliber
Rifle-caliber Micro ARP uppers in 5.56 NATO / .223 Wylde, 7.62x39 and 300 Blackout are the most affordable, usually around $200 to $300 for the upper alone. Pistol-caliber Micro ARPs in 9mm and 10mm cost more, roughly $300 to $500 for the upper, because they use dedicated blowback bolts, magazine-specific lowers and heavier buffers. Complete 10mm pistols are at the top of the range, up to about $900.
2. Barrel length
Micro ARPs are built around 3, 4, 4.5 and 5 inch barrels. The barrel length itself changes the price only a little. What matters more is the handguard and muzzle device that come with it: a 5 inch upper with a simple slick handguard can cost less than a 4.5 inch upper with a premium muzzle brake or suppressor-ready mount.
3. Finish and color
Standard black anodized builds are the least expensive. Cerakote colors, two-tone builds and engraved or accent-series uppers add to the price.
4. Brace, buffer and lower
Complete pistols include the lower receiver, fire control group and a micro buffer system, which is why they cost more than an upper alone. The brace or stabilizer you choose (for example SBA3, SBA5 or HBPDW style) also moves the final price.
Complete pistol, upper or kit: which is the better buy?
- You already own an AR-15 lower: a Micro ARP upper is the cheapest way in. Make sure your lower is set up with a buffer system that matches a micro upper.
- You want a finished gun with no assembly: buy a complete Micro ARP pistol. It ships to your local FFL dealer for transfer.
- You like to build: a pistol kit gives you the matched upper and parts at a lower price than a complete pistol.
In most states the lower receiver is the regulated part and the upper assembly is not, but state and local laws vary, so check the rules where you live before you order.
How to choose the right Micro ARP for your budget
- Pick the caliber first. 300 Blackout for suppressed use, 7.62x39 for cheap ammo with energy, 5.56 for the lightest recoil and the widest ammo choice, 9mm or 10mm if you want a pistol-caliber carbine feel.
- Pick the barrel length. 4 to 4.5 inch for the most compact build, 5 inch for a little more velocity and a longer handguard.
- Decide between an upper and a complete pistol based on whether you already own a lower.
- Add finish and accessories last. Color, brace and muzzle device are where the price climbs.
Browse every configuration on the Micro ARP page, or compare calibers in our guides Micro ARP 7.62 vs 300 Blackout and 300 Blackout vs 8.6 Blackout for Micro ARP builds.
Micro ARP price FAQ
How much is a Micro ARP?
A complete Micro ARP pistol from Moriarti Armaments typically costs about $530 to $900. An upper assembly alone costs about $180 to $500, and a pistol kit about $400 to $600.
Why are 9mm and 10mm Micro ARPs more expensive?
Pistol-caliber Micro ARPs need a dedicated blowback bolt, a compatible magazine-fed lower and a heavier buffer system, so the parts cost more than a standard 5.56 or 300 Blackout gas-operated upper.
Is it cheaper to buy a Micro ARP upper or a complete pistol?
If you already own an AR-15 lower, the upper is the cheapest option. If you do not, a complete pistol or a pistol kit is usually better value than buying every part separately.
Where are Moriarti Micro ARPs made?
Moriarti Armaments builds its Micro ARP pistols and upper assemblies in Miami, Florida.
