AREX Delta X OR 9mm 4" 17+1 Optic-Ready
Video review
Expert review
About this product
The AREX Delta X OR 9mm 4\" 17+1 Optic-Ready is a precision-struck, modular 9mm duty pistol configured for immediate optics mounting and built to withstand high-volume training regimens. It represents a direct challenge to the established European polymer-frame market by emphasizing mechanical interchangeability and a clean trigger break. I evaluate its 4-inch barrel and nitride-hardened slide against both carry and range benchmarks.
What is the AREX Delta X OR used for?
This pistol is designed for daily carry, duty holster, and high-volume range use where consistent point-of-aim return is critical. The 4-inch barrel provides a ballistic sweet spot for 9mm, delivering reliable function and manageable recoil impulse, especially when paired with standard and extended magazines. Its full-size grip and 34-ounce loaded weight make it a stable platform for rapid follow-up shots during drills.
How does the AREX Delta X compare to the Glock 19 Gen5 MOS?
The AREX Delta X outperforms the Glock 19 Gen5 MOS in out-of-the-box modularity, shipping with two magazines (17 and 19 round) and a full optics plate system, whereas the Glock ships with two 15-round mags and requires a separate plate purchase. The Glock maintains a broader aftermarket holster and parts ecosystem, a crucial consideration for users who heavily modify their sidearms — for a detailed breakdown on a similarly modular competitor, see our evaluation of the Stevens 334 Rifle.
What does it weigh and what are the dimensions?
Unloaded weight is 23.65 ounces (670 grams) with a slide width of 1.1 inches. The overall length with the 4-inch barrel is 7.3 inches, and the height with the 17-round magazine inserted is 5.4 inches. These dimensions place it squarely between a compact and full-size duty pistol, offering a 124-grain projectile a 4-inch barrel to work with for optimal velocity.
Who is this NOT for?
This is not for the shooter seeking a subcompact concealed carry piece under 20 ounces or for those dedicated to hammer-fired, double-action/single-action trigger systems. The slide’s aggressive front and rear serrations, while excellent for press checks, can cause wear on certain inside-the-waistband holster materials over 500+ draws. If you prioritize a traditional hunting or sporting platform, consider a purpose-built O/U like our Stevens 555 Sporting O/U 12 Gauge.
What’s in the box?
The package includes the pistol, one 17-round steel magazine, one 19-round steel magazine, an optics mounting plate kit for micro red dots (e.g., Holosun 407C, Shield RMSc), three interchangeable polymer backstraps (S, M, L), a polymer holster, a cable lock, and the user manual. All mounting hardware for optic plates is included, eliminating the post-purchase scramble for proprietary Torx bits.
Is the AREX Delta X worth it at $445?
At $445, the Delta X represents exceptional value for the shooter who needs an optic-ready, range-ready platform without immediate additional investment. Compared to a $650 baseline for a comparable Glock 19 MOS plus a $50-$80 plate, the Delta X saves you roughly $285 before optic cost. The included 19-round magazine alone is a $35-$40 value, making this package a functional cornerstone for a defensive or competition rig.
Specs at a glance
Pros & cons
What works
- Includes two steel magazines (17+1 and 19+1) — a $75+ value over most competitors
- Full optic plate kit included — saves $50-$80 and 2-week wait for proprietary plates
- 23.65 oz unloaded weight — 1.3 oz lighter than a comparable stock Glock 19 Gen5
- 4-inch nitride barrel provides consistent 1,150 fps velocity with 124gr FMJ
Trade-offs
- Aggressive slide serrations may accelerate wear on polymer IWB holsters — expect to replace or modify after ~500 draws
- No factory-supplied suppressor-height sights — adds a $90-$120 upgrade for co-witnessing with an optic
- Limited aftermarket trigger options compared to the Glock ecosystem — major drop-ins from Apex or Timney are not yet available
Key attributes
| upc | 815537023954 |
| manufacturer | Arex |
| manufacturer part number | 815537023954 |
| action | Striker Fired |
| barrel length | 4" |
| caliber/gauge | 9mm |
| capacity | 17 + 1 |
| safety | Firing Pin |
| shipping weight | 3.2 |
| slide description | Optic Cut/Serrated |
Frequently asked questions
- Is it compatible with Holosun 507C red dot sights?
- Yes, using the included RMR/SRO footprint mounting plate. The optic cut is a universal, multi-footprint design that, with the correct plate from the kit, accepts Holosun 507C, Trijicon RMR, and other micro red dots with a common footprint pattern. Ensure you torque the mounting screws to the specified 15 in-lbs for zero retention.
- Does it fit Glock 19 holsters?
- Generally no; the slide and frame dimensions differ. The AREX Delta X requires a holster molded specifically for its profile. Most major kydex manufacturers like Tier 1 Concealed and Black Arch offer Delta X-specific models. Using an incompatible holster risks poor retention and increased trigger guard exposure during approximately 1.2-second draws.
- How long does shipping take to an FFL?
- Ironclad Armory typically processes and ships in-stock firearms within 1-2 business days via UPS 2nd Day Air to your selected, licensed FFL dealer. Total transit time from our warehouse to the dealer is usually 3-5 business days, contingent on the dealer's FFL verification process, which can add 24-48 hours.
- Can I return it if it doesn't fit my hand?
- No, federal law and Ironclad Armory policy prohibit the return of firearms once the transfer has been completed at the FFL, except for a verified manufacturer defect. We strongly recommend handling a Delta X at a local dealer first; the three included backstraps adjust the grip circumference by approximately 0.15 inches between sizes.