Patriot Ordnance Factory EFP Two-Stage Straight Trigger – 4 lb Drop-In AR-Platform Upgrade (00516)
Upgrade your AR with the Patriot Ordnance Factory EFP Two-Stage Straight Trigger (00516) and experience a crisp 4 lb pull, enhanced finger placement, and rock-solid reliability. Designed as a precision drop-in trigger for AR-platform rifles, this EFP (Enhanced Finger Placement) unit combines a straight trigger bow, two-stage operation, and a black hardcoat anodized housing for serious shooters who demand repeatable performance shot after shot. Hinterland Outfitters+1
Whether you’re building a new AR, refreshing a trusted workhorse, or tuning a competition rig, this Patriot Ordnance Factory (POF-USA) 00516 trigger delivers clean breaks, consistent pull weight, and fast follow-up shots in a compact, self-contained module.
Enhanced Finger Placement (EFP) – Natural, Repeatable Trigger Control
The standout feature of this trigger is POF’s Enhanced Finger Placement (EFP) design. The straight bow is shaped with a forward geometry that naturally guides the pad of your finger to the same resting point every time. Fort Scott Gear+3Palmetto State Armory+3Elite Firearms+3
That means:
Consistent trigger finger position for repeatable trigger pulls
More intuitive control under stress, on the clock, or in dynamic shooting
Improved ergonomics for shooters who prefer a flat / straight trigger shoe
If you like a modern flat trigger that promotes proper finger placement and leverage, the EFP profile is a major upgrade over standard mil-spec curved bows.
True Two-Stage, 4 lb Total Pull Weight
While some listings previously referred to this unit as single-stage, POF-USA’s two-stage spec is clear: the Straight EFP model is a 2-stage trigger with a 4.0 lb total pull weight (approx. 2.0 lb first stage, 2.0 lb second stage). Hinterland Outfitters+1
What that gives you:
A light, predictable first stage “take-up”
A well-defined wall before the break
A crisp, clean second-stage break with minimal overtravel
Two-stage triggers are ideal for precision and practical shooting alike, allowing you to prep the trigger, hold at the wall, and break the shot exactly when your sight picture is perfect.
Drop-In, Self-Contained Housing – Easy AR Trigger Upgrade
The POF 00516 trigger is a drop-in, self-contained module that simplifies installation in most standard AR-platform lowers. It arrives pre-assembled in a black hardcoat anodized aluminum housing with rubber urethane feet on the bottom for added stability. Hinterland Outfitters+2Fort Scott Gear+2
Key benefits:
No loose springs and pins to juggle like traditional GI-style triggers
Quick upgrade path for builders and home gunsmiths (no complex fitting in most AR lowers)
Rubber feet help keep the module snug and secure inside the receiver pocket
This is a true plug-and-play AR trigger that’s ready for competition, hunting, and tactical applications right out of the box.
Built from A2 Tool Steel – Heat-Treated & Nitride Finished
POF-USA builds this trigger for serious duty and high round counts. The trigger, disconnect, and hammer are all wire EDM cut from American A2 tool steel, then heat-treated and nitride finished for strength and corrosion resistance. Patriot Defense Gear+3Hinterland Outfitters+3Elite Firearms+3
According to product specs, components are:
Nitride heat-treated to around 70 Rockwell case hardness
Designed to resist wear, peening, and surface corrosion
Engineered to maintain a consistent pull feel over thousands of cycles
If you demand a trigger that can survive hard use in all seasons, this POF unit is built to last.
Black Hardcoat Anodized Finish – Rugged & Low-Profile
The aluminum trigger housing is coated in a black hardcoat anodized finish, providing:
Excellent abrasion and impact resistance
A low-glare, tactical appearance that blends with most AR receivers
Added protection against moisture, solvents, and field abuse Hinterland Outfitters+1
Paired with the nitride-treated steel internals, the finish helps create a durable, long-life trigger system for serious AR shooters.
Includes KNS Precision Anti-Walk Pins
Each POF 00516 EFP trigger ships with custom-fit stainless steel KNS Precision anti-walk pins. These pins are designed to secure the trigger module in place on: Hinterland Outfitters+2Patriot Defense Gear+2
The result is a solid, movement-free installation that prevents pin walkout under heavy recoil or high-volume shooting—ideal for duty rifles, competition rigs, and hard-use carbines.
AR-Platform Compatibility & Important Fit Notes
This trigger is built for standard AR-platform rifles and POF-USA’s ambidextrous lowers, but there are a few important compatibility notes from POF and major retailers: Fort Scott Gear+3Hinterland Outfitters+3Patriot Defense Gear+3
Compatible with:
NOT compatible with:
Always confirm your receiver type before purchase and installation to ensure proper fit.
Ideal Applications – Where the POF 00516 EFP Trigger Shines
With its two-stage design, 4 lb pull weight, and enhanced finger placement, this trigger is perfect for:
Precision AR builds – take advantage of the two-stage wall for more deliberate, accurate fire
3-Gun and carbine competitions – fast, repeatable pull with minimal overtravel
Tactical / defensive rifles – consistent break and improved control under stress
Hunting ARs – crisp shots at distance when that perfect opportunity presents itself
If you’re looking for a trigger that bridges the gap between duty-ready durability and match-grade feel, the Patriot Ordnance Factory EFP Two-Stage Straight Trigger is an outstanding choice.
Technical Specifications – Patriot Ordnance Factory 00516 EFP Trigger
Based on manufacturer and distributor data: Shooting Surplus+3Hinterland Outfitters+3Patriot Defense Gear+3
Manufacturer: Patriot Ordnance Factory (POF-USA)
Model: EFP (Enhanced Finger Placement) Two-Stage Straight Trigger
Part Number (MPN): 00516
UPC: 847313005168
Platform: AR-Platform
Trigger Type: Two-stage, non-adjustable, drop-in
Total Pull Weight: ~4.0 lbs (approx. 2.0 lb first stage, 2.0 lb second stage)
Trigger Shoe: Straight / flat, EFP profile
Housing Material: Anodized aluminum with black hardcoat finish
Internal Components: A2 tool steel, wire EDM cut
Treatment: Nitride heat-treated, ~70 Rockwell case hardness
Pins: Includes custom-fit stainless steel KNS Precision Anti-Walk Pins
Hand: Ambidextrous
Use Case: Competition, hunting, tactical, and general AR shooting
Why Choose the POF EFP Two-Stage Straight Trigger for Your AR?
If you’re still running a gritty mil-spec trigger, the Patriot Ordnance Factory 00516 EFP Two-Stage Straight Trigger is a massive upgrade in feel, control, and consistency. You get:
A clean, predictable 4 lb two-stage break
A flat EFP trigger shoe that improves finger placement
Rugged A2 tool steel internals and a hardcoat anodized housing
Drop-in installation with included anti-walk pins
Proven performance for competition, hunting, and defensive AR builds
For shooters who want premium trigger performance without a complicated installation, this POF-USA EFP trigger is a top-tier option that can transform the way your AR shoots.
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