The Sprinco USA TRIPLE BLACK EXTRACTOR INSERT & VITON O-RING 3 PK offers MIL-SPEC AR-15 extractor inserts paired with Viton O-rings to enhance reliability, seal, and performance across a range of operating conditions. Designed to fit standard AR-15 bolts and bolt carriers, these inserts help ensure consistent extraction and chamber sealing, reducing gas leakage and improving repeatable cycling under varying temperatures and ammo types. The triple black finish provides durable, corrosion-resistant wear resistance, while the Viton O-rings maintain a dependable seal against carbon buildup and debris, contributing to smoother ejector action and reduced misfeeds. Ideal for builders and shooters who demand precision-fit components, these inserts align with MIL-SPEC tolerances to support durable, long-term service in rugged environments. Whether upgrading an existing bolt group or assembling a precision rifle, Sprinco USAs extractor inserts and O-rings can help optimize extractor grip, reduce timing issues, and enhance reliability during critical shots. This three-pack provides ample supply for replacement, tuning, or future maintenance, enabling consistent performance when you push your AR-15 to its limits.