ODIN Works H-FRT Heavy Buffer (AR-15)

The ODIN Works H-FRT pairs a machined 303 stainless steel buffer body with a proprietary flat wire spring, sold as a matched unit for AR-15 carbines running a forced reset trigger. A standard mil-spec carbine buffer runs roughly 3 ounces; the H-FRT body weighs 6.2 ounces. That added reciprocating mass slows the bolt carrier enough that it dwells long enough for the forced reset trigger to complete its mechanical reset on every shot, rather than out-running the reset and inducing skipped or sluggish cycles.

Forced reset triggers couple the trigger reset to bolt carrier travel, which makes buffer weight and spring rate a functional variable rather than a recoil preference. Too little mass and the carrier finishes its stroke before the trigger resets; too much and the carrier short-strokes and the FRT stops working entirely. ODIN Works tuned the H-FRT body and its flat wire spring together to land inside that window, which is why the spring ships with the buffer and is not an optional pairing. Running the body with a stock carbine spring or a generic flat wire changes the cycling behavior it was tuned around.

The one-piece 303 stainless body is a deliberate choice over a stacked tungsten or steel weight buffer. Internal weights can shift under repeated high-rate impulses, and any play changes the effective buffer weight at the moment of impact; a single machined body keeps the buffer's contribution to the cycle consistent shot after shot. The H-FRT drops into a standard AR-15 carbine buffer tube and is rated for barrels over 10 inches. It is a final-stage tuning part: install the trigger, confirm function, then swap to the H-FRT and its spring as a unit.