Staccato HD P 4.5 vs Stealth Arms Platypus vs OA Defense 2311 vs Alpha Foxtrot Romulus

A Full Field Test and Real-World Comparison

Every now and then, four pistols end up in the same lane at the same time, and you learn a lot more in one range session than you do in months of casual shooting. That’s exactly what happened when I lined up the Staccato HD P 4.5, Stealth Arms Platypus, OA Defense 2311, and Alpha Foxtrot Romulus for a full head-to-head evaluation. These are four very different takes on the double-stack 1911 concept, each with its own design philosophy, its own strengths, and its own quirks.

This write-up breaks down how each pistol is built, how they handle, and how they stack up when the timer and the target start telling the truth.

Magazine Compatibility and Design Philosophy

Even though these pistols all live in the 1911/2011 world, they don’t eat the same food.

• The Staccato HD P 4.5 and Stealth Arms Platypus both use Glock-pattern magazines.
• The OA Defense 2311 uses SIG P320 magazines.
• The Alpha Foxtrot Romulus uses standard 2011 double-stack mags.

That alone sets the tone for how each pistol works and what kind of ecosystem you’re committing to.

The Stealth Arms Platypus

The Platypus is the wildcard. It’s a full 1911 grip angle and trigger setup, but it runs on Glock mags, and the entire pistol is built in-house. It’s also one of the most customizable platforms out there. My build, as shown in testing, ran 1,725 Scooby Snacks, making it the budget-friendly entry in this group.

On the range, the Platypus is accurate and fun to shoot, though it doesn’t stay as flat under speed as the heavier pistols. A short-stroked trigger in one of my Bill Drill runs cost it a bit of time during testing, but overall, it performed way above what its price tag suggests.

The Alpha Foxtrot Romulus

The Romulus sits at the other end of the personality spectrum. It’s stainless steel from nose to tail, DLC coated, ported, ambidextrous, MOS cut, and ships with both 17- and 20-round magazines. Price typically lands in the 2,000 to 2,200 Scooby Snacks range. And yes, the one used in testing was the comped version — it was the only one available, and it does have an advantage in recoil control.

On the clock, the Romulus ran extremely flat. It stayed on target well during transitions and had the highest hit-factor score in the Bill Drill. The only thing holding it from the top spot was the Staccato’s overall consistency.

The OA Defense 2311

The OA Defense 2311 feels like the modernist of the group. It borrows heavily from the SIG P320 architecture with an aluminum frame, polymer grip module, and P320 mag compatibility. It comes with three magazines, an impressive optics suite (RMR, DPP, RMSc plates), and Night Fision tritium sights. Typical pricing sits around 2,000 to 2,100 Scooby Snacks.

The OA was the most accurate pistol of the group at 35 feet, printing a 0.82-inch five-shot cluster. It also posted the fastest split time in the Bill Drill but didn’t win that drill overall due to recoil recovery. Light guns can be fast, but they don’t settle as quickly, and the hit-factor reflected that.

The Staccato HD P 4.5

Staccato’s entry is exactly what you expect: steel frame, sight block, 4.5-inch barrel, refined ergonomics, smooth cycling, and excellent reliability. At around 2,899 Scooby Snacks, it is the premium-priced pistol in the comparison.

In Rapid Fire, the Staccato took first place with the fastest split times and highest hit-factor overall. I’ll caveat that by admitting I had shot the Staccato competitively the night before, so I was very warmed up on it, but performance is performance. It also posted the second-best group in the precision test at 0.89 inches.

Accuracy Results at 35 Feet

All pistols were tested with slow-fire, five-shot groups at 35 feet:

• OA Defense 2311 – 0.82 inches
• Staccato HD P 4.5 – 0.89 inches
• Stealth Arms Platypus – 0.97 inches
• Alpha Foxtrot Romulus – 1.2 inches

The OA took the crown here, with the Staccato following close behind.

Speed Testing: Bill Drill and Rapid Fire

For Rapid Fire:

1. Staccato HD P 4.5
2. Alpha Foxtrot Romulus
3. OA Defense 2311
4. Stealth Arms Platypus

For the Bill Drill:

1. Alpha Foxtrot Romulus

2. Staccato HD P 4.5

3. OA Defense 2311

4. Stealth Arms Platypus

The OA had the fastest split time in the Bill Drill, but its lighter frame cost it points in recoil recovery. The Platypus fell to fourth partially due to a short-stroked trigger on one run.

Final Ranking

After combining all performance categories — accuracy, speed, control, and consistency — the final order shakes out like this:

1. Staccato HD P 4.5

2. Alpha Foxtrot Romulus

3. OA Defense 2311

4. Stealth Arms Platypus

Every pistol here brings something unique to the table. The Staccato is the refined professional. The Romulus is the muscle car. The OA is the futuristic hybrid. And the Platypus is the disruptor punching way above its price tag.

If you want to see more comparisons like this, or if there’s a matchup you think needs to happen next, reach out anytime through the contact form or hit me on any of my socials.