The Aero Precision Mil-Spec Carbine Buffer Spring (Aero Precision part no. APRH100504C) is a silver-finished, made-in-the-USA spring built for AR-15 carbines running a collapsible buttstock. Aero Precision cuts it to mil-spec carbine dimensions, so it drives the buffer and bolt carrier group forward after each shot without hanging up. It works equally well finishing out a new build or replacing a factory spring that’s lost tension from years of use. A tired recoil spring is an easy thing to overlook until cycling gets sluggish, and this is a straightforward, direct-fit way to rule it out.

Key Specifications

• Cut to Mil-Spec carbine dimensions, for AR-15s running a collapsible buttstock.
• Made in the USA.
• Finished in silver.
• Functions as a buffer spring, returning the buffer and bolt carrier group forward after each shot.

Frequently Asked Questions

Will this fit a rifle-length buffer tube? No, this spring is cut to Mil-Spec carbine dimensions for a collapsible-stock setup, not a fixed rifle-length tube.

Is this for a new build or a replacement? Both; it works as a component for a new build or as a direct replacement for a factory spring that’s lost tension.

Buy the Aero Precision Mil-Spec Carbine Buffer Spring

Sluggish cycling on an otherwise healthy AR-15 often traces back to a tired recoil spring, and this Aero Precision spring is a straightforward, made-in-the-USA fix. Order it from our Lubbock, Texas gun shop, and we’ll get it out to you as soon as it’s ready, along with more AR buffer system parts.