The TacFire safety selector detent and spring set puts ten complete detent-and-spring pairs in a single pack (brand part no. MAR115-10PK), which is exactly how a working bench wants them stocked. Anyone who has assembled a lower receiver knows the safety detent spring is the part that launches itself across the shop floor and disappears forever. Buying them ten at a time turns a build-stopping loss into a shrug. These are mil-spec dimensions, made in the USA, and drop straight into AR-15 and AR-10 pattern lowers. Keep a pack in the range bag and another in the toolbox and you will never stall a build over a part that costs pocket change. TacFire builds these to the same standard as the rest of their lower parts line.

Key Specifications

• Each pack contains ten complete detent-and-spring sets, enough to cover a decade of builds or one very unlucky afternoon.
• The selector detent measures 0.38 inches long, matching the mil-spec pocket depth in a standard lower receiver.
• The detent spring measures 0.91 inches long, giving the correct preload so the selector indexes crisply between safe and fire.
• Fitment covers AR-15 and AR-10 pattern lowers, so one pack serves both a carbine build and a large-frame rifle.
• The parts are made in the USA to mil-spec dimensions rather than loose commercial tolerances.
• Both halves of the interface ship together as a matched set, so the detent and spring are never mismatched from different suppliers.

Frequently Asked Questions

Will these fit an AR-10 as well as an AR-15? Yes. The safety selector detent and spring are the same mil-spec dimensions on both AR-15 and AR-10 pattern lower receivers, so a single pack covers both platforms.

How many complete sets come in a pack? Ten. Each set includes one selector detent and one detent spring, giving you ten full replacements.

Do I need any special tools to install one? No specialty tooling is required beyond what a standard lower parts installation calls for. The detent drops into its pocket and the spring is captured by the pistol grip when the grip is torqued down.

Buy the TacFire AR-15 Safety Selector Detent and Spring Set

Small parts like this are the difference between a finished rifle and a half-assembled receiver sitting on the bench. Stocking a ten-pack costs less than a box of ammunition and removes one of the most common build delays entirely. Browse it alongside the rest of our small AR-15 parts and order from our Lubbock, Texas gun shop for fast direct shipping to your door.