Elftmann ELF-SE PRO | Drop-In AR Trigger w/ PRO-LOCK & FA Knob | Straight | 2.75 lb | Red

The Elftmann ELF-SE PRO Drop-In AR Trigger with the PRO-LOCK retention system and FA Knob, in a straight shoe at 2.75 pounds and finished in red, delivers unmatched stability, control, and user customization across all AR platforms. The straight trigger shoe is the choice of precision and competition shooters who want a consistent finger contact point regardless of how their hand sits on the grip. Combine that with a crisp 2.75 pound factory set pull and a retention system that eliminates module movement and you have a trigger built for people who measure their groups. Elftmann engineered this one for shooters who demand precision and adaptability.

What the Elftmann ELF-SE PRO Drop-In Trigger Delivers

Drop-in trigger modules solved the consistency problem of loose parts and hand fitting, but they introduced a new one. A cassette sitting in a lower receiver can shift under recoil unless something holds it firmly in place.

Elftmann’s proprietary PRO-LOCK system securely anchors the trigger module inside the lower receiver, eliminating movement under recoil or sustained fire. It gives you the solid feel of a fixed pin trigger while keeping the simplicity of a drop-in installation, with no adhesives, proprietary pins, or permanent modifications required.

This trigger is engineered for competition, tactical, and precision rifle applications where the break has to be identical every time.

Key Features

Elftmann built the Elftmann ELF-SE PRO Drop-In AR trigger around control and repeatability above everything else.

• Straight trigger shoe for a consistent contact point and a purely rearward press.
• Crisp 2.75 pound factory set pull weight suited to precision work.
• PRO-LOCK retention system that anchors the module and eliminates movement under recoil.
• Flat Adjustable FA Knob for on the fly user adjustment.
• Drop-in installation with no adhesives, proprietary pins, or permanent modifications.
• Red anodized finish that stands out clearly inside the receiver.

Specifications and Why a Straight Shoe Changes Things

Elftmann ELF-SE PRO Drop-In trigger shoe geometry is straight. Factory set pull weight is 2.75 pounds. The retention system is PRO-LOCK, and the adjustment interface is the FA Knob. It fits all AR platforms.

The straight shoe is not a style choice. A curved trigger has one sweet spot where the finger meets the shoe perpendicular to the travel, and moving up or down changes the effective leverage and therefore the felt pull weight. A straight shoe removes that variable, so shooters with different hand sizes or different grip positions all get the same break.

At 2.75 pounds, the pull is light enough for deliberate precision work while remaining heavy enough to be handled safely by a trained shooter. The FA Knob adds on the fly adjustability, letting you tune the trigger to the task without disassembly.

Installation, Safety Checks, and Care

Installation is genuinely drop-in. Remove the existing trigger group, seat the module, install the pins, and engage the PRO-LOCK system per Elftmann’s instructions. No fitting, no filing, and nothing that cannot be reversed.

Function check thoroughly before live fire. With the rifle verified unloaded, check that the trigger resets properly, that the safety blocks the trigger in both positions, and that the hammer does not follow the bolt carrier when you cycle the action by hand. Repeat the check after any adjustment.

Keep the module clean and use only a light film of oil, since drop-in triggers run best fairly dry and excess lubricant collects carbon inside the cassette. Blow debris out with compressed air during normal cleaning. Explore more triggers and internals in our parts and upgrades category.

Consider your grip and trigger reach together. A straight shoe sits slightly farther forward at the bottom than a curved one, so shooters with shorter fingers sometimes prefer to pair it with a grip that has a reduced angle. Test both before settling, because trigger reach is personal and the right combination feels effortless.

Stable, crisp, adjustable, and unmistakable in red, this straight shoe Elftmann Tactical module is a serious upgrade for precision AR builds. Ships direct to your door, no FFL required.