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This is Nowlin's answer for anyone wanting to squeeze real match-grade accuracy out of a Commander-sized 1911 chambered in 45 ACP. The 4.25" barrel is machined from bar stock 416R stainless steel and hardened to 40 Rockwell C, then rifled using Nowlin's signature ECM (electrochemical machining) process. That rifling is what sets these apart. It produces an ultra-smooth bore that Nowlin measures at 8 RMS, with groove and bore tolerances held to roughly two ten-thousandths of an inch. Tight numbers like that are why these barrels have a reputation for shooting well under half an inch at 25 yards off a test fixture.
This is the ramped pre-fit version, and it ships as a complete kit rather than just a bare barrel. You get the barrel along with a stainless barrel bushing (.581 ID, .701 OD), a .278 link, and a hardened oversize link pin. The hood, chamber, bottom feet, and top locking lugs all come pre-fit to close, accuracy-improving tolerances, so most of the tedious hand-fitting is already handled. Expect little to no fitting on many guns, though minor bushing fitting to the slide can pop up on a few. The pre-cut top lugs are designed for maximum engagement and to center the firing pin dead on the primer.
The integral ramp supports more of the case head than a standard non-ramped design, which helps with feeding reliability and case head containment on hotter loads. Keep in mind this style fits frames that have been bridge cut to the Nowlin/Wilson pattern, so if your frame isn't already set up for a ramped barrel it'll need that machining done first.
Nowlin has been building 1911 barrels for a long time, and folks who run them in match guns consistently praise the accuracy and the mirror-like bores. With reports of 45 ACP barrels running past 200,000 rounds, this is a part built to outlast the rest of your pistol.
The hood, chamber, bottom feet, and top lugs come pre-fit to close tolerances, so many guns need little to no work. That said, minor fitting of the bushing OD to your slide can be needed on some pistols, and results vary from frame to frame. Plan for some light hand-fitting and consider it a bonus if it drops right in.
No, this ramped barrel is made for frames that have already been bridge cut to the Nowlin/Wilson pattern. If your frame isn't set up for a ramped barrel yet, it will need that machining done first. A non-ramped Nowlin barrel is the better route for a standard GI-style frame ramp.
Nowlin's Cathode Electrode Discharge Machined rifling produces an extremely smooth and uniform bore, measured at 8 RMS with tolerances held around .0002 inch. That smoothness helps with both accuracy and velocity, and it's a big reason these barrels earn a reputation for tight groups. The tradeoff to know about is that the ECM process leaves a smaller minor diameter, so a special chamber reamer is needed if any chamber work is required.
These are built for serious round counts. Nowlin reports customers running 45 ACP barrels past 200,000 rounds and still going strong, thanks to the 416R stainless and triple heat treatment. For most owners, this barrel will outlast the rest of the pistol.
| UPC | 085382302362 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | RB45-4PF |
| Barrel Length | 4.25'' |
| Model | |
| Style | Ramped |
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