1911 Mainspring Housing Hone – Flexible, 400 Grit

Boost your 1911’s performance with the TMC 400‑grit Mainspring Housing Hone. This flexible hone smooths the spring tunnel and removes rough machining marks left during drilling. As a result, your pistol cycles faster, the hammer falls cleaner, and the action feels smoother overall.

Why Start with 400 Grit?

The 400‑grit hone works as the first step in a proven two‑step process. First, it cuts down sharp ridges and high spots inside the spring tunnel. Then, it creates an even surface that prepares the housing for final polishing with an 800‑grit hone. Because friction drops, hammer movement improves and reliability increases.

Built for Control and Consistency

This hone uses a twisted steel wire shaft that stays flexible yet strong. In addition, abrasive globules mounted on nylon filaments maintain steady contact with the tunnel walls. The silicon carbide abrasive removes material evenly, while the 4‑inch length gives you excellent control during use.

Best Results, Every Time

For best results, use honing oil during the process. The oil lubricates the tunnel, helps prevent galling, and promotes a smooth, uniform finish. Therefore, each pass stays controlled and effective.

Ideal for Any 1911 Project

Whether you tune a range gun, refine a competition pistol, or rebuild a classic 1911, this 400‑grit hone delivers clear results. Moreover, when paired with the 800‑grit hone, it helps unlock smoother cycling, faster hammer fall, and a more refined shooting experience.