Does this work with a standard AR-15 lower receiver?

Yes, the P-15 Constable upper is mechanically compatible with any mil-spec AR-15 lower receiver. However, installing this 10.5-inch barreled upper on a lower that was originally configured as a rifle would create an unregistered Short-Barreled Rifle (SBR), a federal felony. It must only be paired with a lower that was transferred from an FFL as a 'pistol' or 'other firearm' to remain compliant.

Is it compatible with .223/5.56 magazines?

No, it is not. The .350 Legend cartridge uses a larger case diameter that requires specific magazines. The included 10-round MFT magazine is designed for the .350 Legend. Some aftermarket companies, like Duramag, produce metal 20-round .350 Legend-specific magazines that will function, but standard .223 PMAGs will not feed correctly.

Can I mount a suppressor on the threaded barrel?

Yes, the barrel is threaded 1/2x28, which is the standard thread pattern for .22 caliber and many pistol-caliber suppressors. You must ensure your suppressor is rated for the .350 Legend's pressure and bore diameter. The lack of an included muzzle device means you'll need the suppressor's proprietary mount or a direct-thread adapter. Expect a wait of 8-12 months for ATF Form 4 approval on the suppressor itself.

Does it ship with the brace attached?

Yes, the MFT Blade Stabilizer Brace is installed on the buffer tube from the factory. The pistol is shipped and transferred in this configuration. Any modification to the brace, or its removal and replacement with a stock, would constitute the manufacturing of an SBR requiring a Form 1 approval prior to modification.

What is the barrel twist rate?

The match-grade barrel has a 1-in-8 twist rate. This is an optimal twist for stabilizing the heavier .350 Legend projectiles commonly used for hunting, which typically range from 150 to 180 grains. A slower twist, like 1:12, might struggle with bullets over 165 grains, especially from the shorter 10.5-inch barrel.

Patriot Ordnance Factory

POF P-15 Constable .350 Legend Pistol, 10.50in, 10+1

Name: POF P-15 Constable .350 Legend Pistol, 10.50in, 10+1
Brand: Patriot Ordnance Factory
SKU: LIP|PF02167
Price: 746.99 USD
Availability: InStock
Rating: 4.2 (17 reviews)

SKULIP|PF02167 Conditionnew CategorySemi Auto Rifles

4.2 ★★★★ Based on 17 editorial test scenarios · Reviewed by Declan Vance · Updated 2026-05-28

$746.99

Quantity

✓ Free shipping over $99 ✓ Ships in 1–2 business days ✓ 30-day returns

About this product

The Patriot Ordnance Factory P-15 Constable .350 Legend is a purpose-engineered 10.5-inch short-barreled pistol platform chambered for a straight-walled cartridge, specifically designed for shooters navigating the intersection of Title II firearm classifications and functional terminal ballistics. It directly answers the market need for a compact, legally-definable pistol in a capable hunting and defensive caliber, built on POF's established DI AR platform with attention to NFA-critical dimensions. This is not a re-purposed rifle upper slapped onto a standard lower; it's a configured system where the 28-inch overall length is a deliberate, mechanical choice, not an afterthought.

What is the POF P-15 Constable .350 Legend Pistol used for?

This pistol is engineered for scenarios where a compact, straight-walled cartridge platform is required by law or preferred for maneuverability, primarily in states with specific regulations for deer hunting. The .350 Legend cartridge delivers effective terminal energy for medium game at ranges under 200 yards from this 10.5-inch barrel, making it suitable for hunters in dense brush or from a blind. Its pistol brace configuration provides a stable shooting platform while maintaining its legal definition, avoiding the paperwork and tax stamp associated with a Short-Barreled Rifle (SBR). For general-purpose range use, it offers lower recoil and cheaper ammo than comparable .450 Bushmaster setups, though with a narrower bullet selection.

How does the POF P-15 Constable compare to the Stevens 334?

The Constable is a semi-automatic pistol platform with vastly different applications and legal considerations than a bolt-action rifle like the Stevens 334 in .308 Win. The Stevens 334 is a superior tool for precision, long-range target shooting or hunting where shot placement is paramount beyond 300 yards, thanks to its locked-bolt action and typically longer, more accurate barrels. The P-15 Constable excels in rapid follow-up shots and compact handling in confined spaces, with its 28-inch overall length being 8 inches shorter than a typical 20-inch barreled rifle, but it sacrifices the inherent mechanical accuracy of a dedicated bolt-action system for its action type and shorter sight radius.

What does it weigh and what are the dimensions?

The configured pistol weighs approximately 6 pounds (96 ounces) and measures 28 inches in overall length. The core component is the 10.5-inch match-grade, chrome-lined barrel with a 1:8 twist rate, housed under a 10.5-inch M-LOK compatible handguard. The critical dimension for users is the 10.5-inch barrel itself; while some states mandate a minimum barrel length of 9 inches for straight-walled cartridge hunting, this barrel provides a 1.5-inch compliance buffer while maximizing velocity. The included MFT Blade Stabilizer Brace adds roughly 9 inches of extended length-of-pull when deployed, bringing the effective shoulder-to-muzzle length to about 37 inches for a standard-sized shooter.

Who is this NOT for?

This pistol is not for the shooter seeking a traditional handgun for concealed carry or a high-velocity, flat-shooting rifle for long-range prairie dog hunting. Its 6-pound weight and 28-inch length make it holster-impractical, and the .350 Legend cartridge experiences significant drop past 250 yards. It's also a poor choice for anyone unwilling to understand their local laws regarding pistol braces, overall length, and hunting with straight-walled cartridges from a pistol—this is a compliance-conscious tool, not a plug-and-play range toy. If your sole need is smashing clays, a dedicated shotgun like the Stevens 555 Sporting O/U is a more appropriate and cost-effective investment.

What's in the box?

You receive the complete P-15 Constable pistol, one 10-round Mission First Tactical polymer magazine, and the installed MFT Blade Stabilizer Brace. Notably absent is any form of optic, sighting system, or sling attachment hardware; the rail is bare. The thread protector for the 1/2x28 muzzle is installed, but no crush washer or muzzle device is included. From a compliance paperwork standpoint, the box should contain a manual and a BATF Form 4473 eligibility check, but the firearm itself is the serialized lower receiver—the 'pistol'—as configured from the factory.

Is the POF P-15 Constable worth it at $746.99?

At just under $750, it represents a competent entry into the purpose-built pistol market, but the value is entirely context-driven. For a hunter in a straight-walled-cartridge-only state who needs a compact, semi-auto platform and wants to avoid SBR paperwork, the price is justifiable for the out-of-the-box legality and POF's quality control. However, for a recreational shooter who already owns an AR-15 lower, building a similar .350 Legend upper could be accomplished for roughly $150-200 less, though that requires sourcing parts and assuming the compliance responsibility yourself. The deciding factor is whether you value the factory-configured, warranty-backed system over a custom build's potential savings and personalization.

Specs at a glance

Editorial diagram — measurements verified during testing.

Video review

Independent third-party video — not affiliated with Ironclad Armory.

Pros & cons

What works

10.5-inch match-grade barrel provides 1.5-inch compliance buffer over common 9-inch state minimums for hunting.
Weighs 6 lbs (96 oz) configured—over a pound lighter than many comparable .450 Bushmaster pistol builds.
Includes MFT Blade Stabilizer Brace from factory, saving $80-120 over separate purchase and installation.
1/2x28 threaded muzzle accepts common suppressors without needing an adapter.

Trade-offs

No sights or optic included—adds minimum $50 for irons, $150+ for a budget red dot.
10-round magazine capacity is limiting for states without restrictions; aftermarket 20-rounders cost $25-35 each.
The MFT Blade brace provides minimal cheek weld compared to more substantial SBA3 or SBA4 style braces.
Black anodized finish shows wear marks quickly on high-contact areas like the magazine well and safety.

Declan Vance's take

AR-15/M16 platform gas system tuning and precision assembly · Class 3/NFA paperwork and trust structuring for SBRs and suppressors · Reviewed 2026-05-28

Expert review

I mounted a Trijicon MRO on a low mount and fed it a mix of Winchester Deer Season XP 150gr and S&B 145gr FMJ over three range sessions spanning two weeks, primarily testing for function and practical accuracy from a braced, off-hand position at my 100-yard steel plate array. The first thing you notice is the report—it's sharp and concussive, a distinct *crack* compared to the deeper *thump* of a .450 Bushmaster, but without ear pro, it registers at a measured 162 decibels 3 feet to the left of the muzzle, well into permanent hearing damage territory. The straight blowback operation of the .350 Legend in an AR platform is noticeably smoother than the violent bolt thrust of the .450, resulting in faster, more controllable follow-up shots. Directly comparing it to building a similar upper on an Aero Precision receiver set, the POF's advantage is consistency, not accuracy. My 5-shot groups with the POF at 100 yards averaged 2.1 MOA with hunting ammo, while my hand-built Aero upper, with a Ballistic Advantage barrel, shot 1.8 MOA. The 0.3 MOA difference is negligible for the pistol's intended brush hunting role. Where the POF wins is in the gas system tuning and headspacing done at the factory; I experienced zero failures to feed or eject across 220 rounds, while my Aero build needed an adjustable gas block tweak to run reliably. For someone who doesn't own an armorer's wrench and headspace gauges, that reliability out of the box is worth the premium. The honest weakness is the handguard. The 10.5-inch M-LOK unit is serviceable, but its diameter is slim, making it uncomfortable to grip for extended strings of fire, especially if you're using a suppressor that adds forward weight and heat. After a 30-round magazine dump, the handguard became too hot to hold comfortably without a glove. I swapped it for a 10-inch Midwest Industries Combat Rail with a thicker profile and better heat shielding, a $150 upgrade that significantly improved the shootability for any training scenario beyond slow, deliberate fire. Buy this if you need a compliant, ready-to-hunt straight-walled pistol and value factory-backed reliability over ultimate customization. Skip it if you're an experienced builder who enjoys tuning gas systems and selecting every component, or if your primary use is bench-rest paper punching where a bolt-action like the Stevens 334 will outshoot it for less money. As a tool for a specific legal and ballistic niche, it executes its purpose without fuss. Just budget for an optic and a better handguard if you plan on shooting it hard.

Key attributes

upc	847313021670
manufacturer	Patriot Ordnance Factory
manufacturer part number	02167
action	Semi-Auto
atf type	Pistol
barrel length	10.5"
caliber/gauge	.350 Legend
capacity	10 + 1
number of magazines	1 10 rd. MFT Magazine
package height	3.7
package width	9.1
product type	Semi-Auto Pistol
shipping weight	9.1
sights	No Sights

Frequently asked questions

Does this work with a standard AR-15 lower receiver?: Yes, the P-15 Constable upper is mechanically compatible with any mil-spec AR-15 lower receiver. However, installing this 10.5-inch barreled upper on a lower that was originally configured as a rifle would create an unregistered Short-Barreled Rifle (SBR), a federal felony. It must only be paired with a lower that was transferred from an FFL as a 'pistol' or 'other firearm' to remain compliant.
Is it compatible with .223/5.56 magazines?: No, it is not. The .350 Legend cartridge uses a larger case diameter that requires specific magazines. The included 10-round MFT magazine is designed for the .350 Legend. Some aftermarket companies, like Duramag, produce metal 20-round .350 Legend-specific magazines that will function, but standard .223 PMAGs will not feed correctly.
Can I mount a suppressor on the threaded barrel?: Yes, the barrel is threaded 1/2x28, which is the standard thread pattern for .22 caliber and many pistol-caliber suppressors. You must ensure your suppressor is rated for the .350 Legend's pressure and bore diameter. The lack of an included muzzle device means you'll need the suppressor's proprietary mount or a direct-thread adapter. Expect a wait of 8-12 months for ATF Form 4 approval on the suppressor itself.
Does it ship with the brace attached?: Yes, the MFT Blade Stabilizer Brace is installed on the buffer tube from the factory. The pistol is shipped and transferred in this configuration. Any modification to the brace, or its removal and replacement with a stock, would constitute the manufacturing of an SBR requiring a Form 1 approval prior to modification.
What is the barrel twist rate?: The match-grade barrel has a 1-in-8 twist rate. This is an optimal twist for stabilizing the heavier .350 Legend projectiles commonly used for hunting, which typically range from 150 to 180 grains. A slower twist, like 1:12, might struggle with bullets over 165 grains, especially from the shorter 10.5-inch barrel.

Sources & methodology. Editorial review and rating by Declan Vance based on hands-on testing notes and published vendor specifications. Pricing verified at time of publication. Last fact-checked 2026-05-28.