OA Defense 2311 Compact Plus Kit 9mm 4.25in 17Rd
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About this product
The OA Defense 2311 Compact Plus Kit 9mm 4.25in 17Rd is a purpose-built compact pistol engineered for everyday carry and defensive use. It pairs an optic-ready, serrated slide with fully ambidextrous controls and a modular magwell to support fast reloads and adaptable grip length. The Plus Kit configures the pistol with a full-size magwell and supplies multiple magazines and optic mounting plates to support a range of sighting options. Night sights are included for low-light utility.
| Manufacturer | OA Defense |
|---|---|
| Model | 2311 Compact Plus Kit |
| Caliber | 9x19mm |
| Barrel Length | 4.25 inches |
| Capacity | 17+1 rounds |
| Slide Material | Stainless steel (per manufacturer specs) |
| Frame Material | Aluminum alloy |
| Finish | Black nitride |
| Weight | 29.5 oz unloaded |
| Sights | Night sights (tritium front, white outline rear) |
| Condition | New |
Key Features
- Modular Magwell System — Why it matters: The Plus Kit includes a full-size magwell that lets you swap between compact and extended grip lengths for concealed carry or competition use without buying a second pistol.
- Optic-Ready Slide — Why it matters: Pre-milled to accept most popular red dot footprints (RMR, RMSc, DPP) and comes with multiple mounting plates, so you can zero your preferred optic right out of the box.
- Fully Ambidextrous Controls — Why it matters: Slide stop, thumb safety, and magazine release are mirrored on both sides, making this pistol equally fast for left- and right-handed shooters during high-stress reloads.
- Serrated Slide — Why it matters: Aggressive serrations front and rear give you a positive grip on the slide under sweaty hands or gloves, reducing fumbles during press checks or malfunction drills.
- Night Sights Included — Why it matters: Tritium front and white outline rear provide instant sight acquisition in darkness, so you’re not fumbling for a flashlight when you need to identify a threat.
Who It’s For
This kit is for the shooter who wants a compact 1911-style 9mm that pulls double duty as an EDC pistol and a range gun. It’s built for concealed carriers who value a shorter barrel and grip but don’t want to sacrifice magazine capacity or optic capability. The Plus Kit also suits shooters who prefer a modular platform to adjust grip length and magwell size without buying additional frames.
Pros & Cons
- Pro: The 4.25-inch barrel balances concealability with a longer sight radius for better accuracy at defensive distances.
- Pro: Comes with three 17-round magazines and multiple optic plates—saves you $150+ in aftermarket parts.
- Con: The full-size magwell adds width at the grip base, which may print more under a tight T-shirt than a standard compact 1911.
Comparison: OA Defense 2311 Compact Plus Kit vs. Competitors
| Feature | OA Defense 2311 Compact Plus Kit | Zev Technologies OZ9C | Agency Arms AOS Compact |
|---|---|---|---|
| Caliber | 9mm | 9mm | 9mm |
| Barrel Length | 4.25 in | 4.0 in | 4.25 in |
| Capacity | 17+1 | 15+1 | 15+1 |
| Magwell Included | Yes (full-size) | No | Optional |
| Optic Plates Included | Yes (multi-pattern) | No | Yes (single pattern) |
| Ambidextrous Controls | Full | Partial | Full |
| Price | $1,949.99 | $2,299.00 | $2,495.00 |
According to OA Defense specs, the 2311 Compact Plus Kit delivers a 17+1 capacity in a package that weighs 29.5 ounces unloaded—a full 2 ounces lighter than the Zev OZ9C and 3 ounces lighter than the Agency Arms AOS Compact. The included magwell and optic plates give you a complete setup for $350–$550 less than the competition.
FAQ
Does this kit work with standard 1911 holsters?
Yes, the OA Defense 2311 Compact Plus Kit fits most 1911-style holsters designed for a 4.25-inch barrel and full-length dust cover. We recommend testing retention with your specific holster before carrying.
What optic footprints are supported?
The slide is milled to accept Trijicon RMR, Holosun 407C/507C, Leupold DeltaPoint Pro, and Shield RMSc patterns. The included mounting plates cover all four footprints.
Can I swap the magwell to a compact version?
Yes, the Plus Kit ships with a full-size magwell, but you can install the standard compact magwell (sold separately) for a flush grip that reduces printing.
Is this pistol California-legal?
No, the OA Defense 2311 Compact Plus Kit is not on the California Roster of Handguns Certified for Sale. It ships to all other states where legal.
What’s the trigger pull weight?
Per manufacturer specs, the factory trigger breaks at 4.5–5.0 pounds with a short reset, suitable for defensive and range use.
Why Buy from Us?
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships 1-2 business days
- ✅ 30-day returns
- ✅ Secure checkout
Browse more options in our Semi Auto Handguns or 1911-Style Pistols collection. Last updated: April 2026. According to NSSF data, compact 9mm pistols account for 38% of all new handgun sales in the U.S., making this one of the most sought-after configurations on the market.