The Armaspec ST45 45-Degree Short-Throw Ambidextrous Safety Selector in FDE (Armaspec part no. ARM112-FDE) is an ambidextrous selector for the AR-10 and AR-15 platforms. Instead of the full 90-degree rotation to disengage the safety, it is set to fire at about 45 degrees, so the shooter can flick the lever and get on the trigger faster. Armaspec describes the action as smooth, with a crisp lockup, and builds it with aluminum levers on a steel core. This listing is the flat dark earth color, made in the U.S.A. and backed by a lifetime warranty. It is made for lowers that carry the matching 45-degree FIRE markings.

Key Specifications

• The selector has a 45-degree short throw, so the lever moves to fire after about 45 degrees instead of the full 90-degree rotation.
• It is ambidextrous, with a lever on each side of the receiver for right-hand and left-hand operation.
• Armaspec lists it for AR 5.56/.223 and 7.62/.308 platforms, covering both AR-15 and AR-10 lowers.
• Construction is aluminum levers on a steel core, which keeps the levers light and the core strong.
• The color is FDE (flat dark earth), a tan finish.
• The selector requires a receiver with 45-degree FIRE markings, because the fire position is set at 45 degrees rather than 90.
• Armaspec makes it in the U.S.A., so it is a U.S.-made part.
• It carries a lifetime warranty from Armaspec.

Frequently Asked Questions

Will it work on any AR lower? No. It is designed for firearms with the correct 45-degree FIRE markings on the receiver to match its fire position, and Armaspec says not to use it on lowers without those markings. For a receiver that does not have them, Armaspec points to its FT90 full-throw selector instead.

What does a 45-degree selector change? The safety disengages after about 45 degrees of lever travel instead of 90, so the operator can flick the lever to fire quicker.

Which platforms is it listed for? Armaspec lists it for AR 5.56/.223 and 7.62/.308 platforms, which covers AR-15 and AR-10 lowers.

Buy the Armaspec ST45 45-Degree Short-Throw Ambidextrous Safety Selector, FDE

If your lower is marked for a 45-degree fire position, the ST45 shortens the safety’s travel and keeps the controls ambidextrous. Order it with other AR safety selectors from our Lubbock, Texas gun shop for fast, insured shipping.