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The Wilson Combat 337B is the blued version of their Bullet Proof Ultralight Skeletonized Hammer, built to drop into a standard 1911 fire control group. The skeletonized spur isn't just for looks. By removing material, Wilson lightens the hammer so it falls faster, which shortens lock time. In plain terms, that's less delay between breaking the trigger and the round going off, and it can help with consistency when you're shooting for accuracy.
Wilson didn't cut corners on the materials. This hammer is fully CNC machined from solid S-7 tool steel bar stock and heat treated to a Rockwell hardness of 48-52. That puts it a cut above cast or injection molded parts you'll find in budget kits, and it's why Wilson backs their Bullet Proof line so hard against breakage. The hammer hooks come cut to .020 inches with an 8 RMS ground finish, which gives a clean, square sear engagement surface that's the foundation of a good trigger job.
There's some smart engineering in the details too. The strut pin hole is positioned to help you dial in a lighter trigger pull, and the body is narrowed so it clears the slide without drag. It also features a narrow half-cock notch similar to what you'd find on a 70 series Colt hammer, which helps protect the sear nose and adds a layer of mechanical safety.
This one is geared toward anyone building or refining a 1911, whether that's a defensive carry gun, a range pistol, or a competition build where every little bit of trigger feel matters. Shooters who've run these report clean fitment and a sharp look, especially when paired with polished or stainless internals.
A quick word on installation. While these are designed as drop-in parts, tolerances vary from one 1911 manufacturer to the next, so some minor fitting can come up. The hammer, sear, and disconnector work as a system, so it's smart to have a qualified gunsmith handle the install and check engagement. Done right, it's one of the better bang-for-effort upgrades on a 1911.
Cutting material out of the hammer spur makes it lighter, so it falls faster when the trigger breaks. That speed reduction is what shortens lock time, meaning there's less delay between your trigger pull and the gun firing. It doesn't change your actual trigger pull weight, but it can help with consistency and follow-through.
It's designed as a drop-in hammer, and plenty of shooters report it fitting their 1911 with no modification. That said, 1911 tolerances vary between manufacturers, so some minor fitting can occasionally be needed. Since the hammer and sear work together to set your trigger engagement, it's smart to have a gunsmith handle the install and check the geometry.
It's fully CNC machined from solid S-7 tool steel bar stock and heat treated to a Rockwell hardness of 48-52. That's a big step up from cast or injection molded parts, and it's the reason Wilson's Bullet Proof line carries such a strong reputation for durability. This is a part built to hold up to high round counts.
It's built to the standard 1911 fire control pattern, so it works across most government and commander style 1911s including Colt. Buyers commonly report clean fitment on Colt Government models. As always with 1911 internals, confirm your pistol uses standard small parts and have a gunsmith verify sear engagement after install.
The main difference is the finish. The 337B is blued for a darker, traditional look that blends well on blued or blacked-out 1911s, while the stainless version is brighter and pairs with stainless or two-tone builds. Function and construction are the same, so it comes down to matching your pistol's aesthetic.
| UPC | 874218001070 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 337B |
| Model | |
| Product Type | Hammer |
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