The Timney AR-15 Competition Trigger, 4lb, Small Pin, Curved, Black (brand part no. 668S) is a self-contained module ready to install in a small-pin AR-15 and deliver a smooth, crisp, creep-free single-stage pull that feels closer to a traditional bolt-action trigger than a combat-rifle unit. It is 100% drop-in with no gunsmithing, fitting, or adjusting required, and every component rides captive inside a lightweight aluminum alloy housing. The hammer is wire-EDM machined from S7 tool steel for hardness and impact resistance, while the remaining components are EDM cut from A2 tool steel and heat-treated to Rc 56-60 for long service life, with precision-ground engagement surfaces for a clean release. It installs using the rifle’s original hammer and trigger pins, and Timney’s proprietary design eliminates pin walkout, making it compatible with all mil-spec AR-15/M4 platforms, including large-pin Colt rifles made in the 1990s. Timney has built triggers since 1946, and every unit is individually tested and calibrated by hand in the action it’s designed for. For AR-15 shooters who want a bolt-action-feeling break in a true drop-in module, this AR trigger is built to that standard.

Key Specifications

• Breaks at a fixed 4-pound pull weight.
• Uses a curved trigger shoe.
• Sized for small-pin AR-15 lowers.
• Ships as a self-contained, 100% drop-in module with no gunsmithing needed.
• All components are captive in a lightweight aluminum alloy housing.
• The hammer is wire-EDM machined from S7 tool steel.
• Remaining components are EDM cut from A2 tool steel, heat-treated to Rc 56-60.
• Installs using the rifle’s original hammer and trigger pins.
• A proprietary design eliminates pin walkout.
• Each unit is individually tested and calibrated by hand before shipping.

Frequently Asked Questions

Will this work with an older Colt AR-15? Yes, the proprietary pin-walkout-eliminating design makes it compatible with large-pin Colt rifles made in the 1990s as well as standard small-pin mil-spec lowers.

Does installation require gunsmithing? No, it is 100% drop-in with no gunsmithing, fitting, or adjusting required.

Is every trigger tested before it ships? Yes, Timney individually tests and calibrates each trigger by hand in the action it was designed for.

Buy the Timney AR-15 Competition Trigger, 4lb, Small Pin, Curved

Tool-steel internals and a pin-walkout-proof design give this drop-in trigger the feel of a hand-tuned bolt gun in an AR-15 lower. Order it from our Lubbock, Texas gun shop for fast, insured shipping.