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Availability: In Stock
The Patriot Ordnance Factory P415 complete upper in 5.56x45mm NATO delivers a piston-driven platform built on over 15 years of refinement. This is a ready-to-run upper receiver assembly for shooters who want a proven, reliable operating system without the long-term maintenance demands of direct impingement. POF's piston design has been tested across demanding environments, making it a solid choice for hunters, competition shooters, and those running hard-use applications where reliability trumps trendy trends.
Built around a 10.50" black nitride barrel and aluminum black anodized receiver, this upper is compact and lightweight—useful if you're building a shorter platform or want a handy rifle for close-quarters hunting or rapid target work. The 9" M-LOK handguard keeps the front end narrow and ergonomic; at 1.75" wide, it won't bulk up your build and leaves plenty of rail real estate for lights, lasers, or bipod mounts if you need them. The M-LOK slots are becoming standard across the industry, so attachments won't be hard to find.
This is a complete upper, meaning the barrel, bolt carrier group, and all internal parts are ready to drop onto a compatible lower receiver. If you're already running a 5.56 NATO lower or planning to build one, this assembly gets you most of the way there. The piston system runs cleaner and cooler than DI, and many shooters appreciate the reduced carrier tilt and easier suppressor-ready platform down the road.
| Caliber | 5.56x45mm NATO |
| Barrel Length | 10.50" |
| Barrel Finish | Black Nitride |
| Receiver Material | Aluminum |
| Receiver Finish | Black Anodized |
| Operating System | Piston Driven |
| Handguard Length | 9" |
| Handguard Width | 1.75" |
| Handguard Slot System | M-LOK |
| Assembly Type | Complete Upper |
This is a complete upper assembly, so you'll need a lower receiver compatible with 5.56 NATO, a firing pin, and a trigger group if your lower is stripped. Once mated to a compatible lower and staked/pinned properly, you'll have a functional rifle.
The 10.50" barrel length makes this well-suited for SBR, pistol, or compact rifle builds where you want a handy profile without excessive weight. Always verify your local and federal regulations regarding barrel length and any applicable registration or permitting.
M-LOK is a standardized mounting system (slots rather than traditional Picatinny rail) that lets you attach lights, bipods, slings, and other accessories without rails covering the entire handguard. It's lighter, cleaner-looking, and has become an industry standard, so aftermarket accessories are widely available.
Piston systems use a short piston rod to cycle the bolt carrier, rather than routing hot gas directly into the receiver like DI platforms. Piston guns typically run cooler, cleaner, and with less carrier tilt, and many shooters find them easier to run suppressed if you go that route in the future.
SKU: 126512495 • Width: 4.4in • Height: 4.4in • Depth: 28.6in • Weight: 5.125oz
Availability: In Stock
The Patriot Ordnance Factory P415 complete upper in 5.56x45mm NATO delivers a piston-driven platform built on over 15 years of refinement. This is a ready-to-run upper receiver assembly for shooters who want a proven, reliable operating system without the long-term maintenance demands of direct impingement. POF's piston design has been tested across demanding environments, making it a solid choice for hunters, competition shooters, and those running hard-use applications where reliability trumps trendy trends.
Built around a 10.50" black nitride barrel and aluminum black anodized receiver, this upper is compact and lightweight—useful if you're building a shorter platform or want a handy rifle for close-quarters hunting or rapid target work. The 9" M-LOK handguard keeps the front end narrow and ergonomic; at 1.75" wide, it won't bulk up your build and leaves plenty of rail real estate for lights, lasers, or bipod mounts if you need them. The M-LOK slots are becoming standard across the industry, so attachments won't be hard to find.
This is a complete upper, meaning the barrel, bolt carrier group, and all internal parts are ready to drop onto a compatible lower receiver. If you're already running a 5.56 NATO lower or planning to build one, this assembly gets you most of the way there. The piston system runs cleaner and cooler than DI, and many shooters appreciate the reduced carrier tilt and easier suppressor-ready platform down the road.
| Caliber | 5.56x45mm NATO |
| Barrel Length | 10.50" |
| Barrel Finish | Black Nitride |
| Receiver Material | Aluminum |
| Receiver Finish | Black Anodized |
| Operating System | Piston Driven |
| Handguard Length | 9" |
| Handguard Width | 1.75" |
| Handguard Slot System | M-LOK |
| Assembly Type | Complete Upper |
This is a complete upper assembly, so you'll need a lower receiver compatible with 5.56 NATO, a firing pin, and a trigger group if your lower is stripped. Once mated to a compatible lower and staked/pinned properly, you'll have a functional rifle.
The 10.50" barrel length makes this well-suited for SBR, pistol, or compact rifle builds where you want a handy profile without excessive weight. Always verify your local and federal regulations regarding barrel length and any applicable registration or permitting.
M-LOK is a standardized mounting system (slots rather than traditional Picatinny rail) that lets you attach lights, bipods, slings, and other accessories without rails covering the entire handguard. It's lighter, cleaner-looking, and has become an industry standard, so aftermarket accessories are widely available.
Piston systems use a short piston rod to cycle the bolt carrier, rather than routing hot gas directly into the receiver like DI platforms. Piston guns typically run cooler, cleaner, and with less carrier tilt, and many shooters find them easier to run suppressed if you go that route in the future.
SKU: 126512495 • Width: 4.4in • Height: 4.4in • Depth: 28.6in • Weight: 5.125oz