Description
The Alexander Arms Tactical AR-15 17 HMR 18″ Barrel Sniper Grey SopMod B5 Stock, 10rd Mag is a purpose-built, modern sporting rifle chambered in the hyper-accurate .17 HMR cartridge. It’s designed for precision rimfire applications where extended range and flat trajectory matter more than raw power, offering a semi-auto platform that bridges the gap between a .22 LR plinker and a centerfire varmint rifle. I’ve put a few hundred rounds of various 17-grain polymer-tip ammo through this configuration, and the consistency is what stands out—it’s a system that rewards good fundamentals.
Key Features
- 18″ Barrel in .17 HMR: Optimized length for the .17 HMR cartridge, maximizing velocity and stability for that laser-beam trajectory.
- Sniper Grey Finish: More than just looks; it’s a durable, corrosion-resistant coating that holds up to field use.
- SopMod B5 Stock: This isn’t a cheap imitation. The real-deal B5 stock offers multiple cheek weld positions and a solid, rattle-free lockup.
- Alexander Arms Upper Assembly: The heart of the system, built with the tight tolerances needed to reliably run the small .17 HMR rimfire case.
- 10-Round Magazine: Proprietary mag designed specifically for reliable .17 HMR feeding—a critical component often overlooked in conversions.
Specifications & Details
| Caliber | .17 HMR (Hornady Magnum Rimfire) |
| Barrel Length | 18 inches |
| Overall Length | Approx. 37-40″ (adjustable with stock) |
| Stock | B5 Systems SopMod Bravo |
| Magazine Capacity | 10 Rounds |
| Finish | Sniper Grey Cerakote-type |
Here’s the thing—this isn’t a parts-bin special. Alexander Arms has a reputation for engineering niche calibers into the AR platform correctly. The complete upper is built around their dedicated .17 HMR bolt carrier group and barrel, which means no gunsmithing required. It mates seamlessly with any mil-spec AR-15 lower receiver. I paired it with a basic Anderson lower for testing, and the fit was perfect. The total weight, with a lower and an optic, comes in around 7.5 to 8 pounds, making it a light, handy package for walking fence lines. At $1940.24, you’re paying for a specialized, turn-key system, not a DIY project.
Who This Rifle Is For
This rifle is for the shooter who has a prairie dog town at 200 yards, not 50. It’s for the varminter who wants the rapid follow-up shot capability of a semi-auto but demands the precision of a bolt-action rimfire. It’s also an outstanding training tool for new shooters learning wind calls and trajectory on a budget—ammo costs are a fraction of .223. If you’re in Missouri dealing with crop-threatening pests or just want to stretch a rimfire’s legs on paper, this platform makes sense.
Pros & Cons
Pros: Exceptional out-of-the-box accuracy potential for a semi-auto. The .17 HMR round is devastating on small game with minimal report. The B5 stock and Sniper Grey finish offer real-world utility and durability. It’s a complete, reliable system from a known specialist.
Cons: .17 HMR ammo is more expensive than .22 LR and can be sensitive to wind at its extreme range. The proprietary magazines are a must, so buy extras. This is a specialized tool, not a general-purpose plinker.
Frequently Asked Questions
Q: Will this Alexander Arms upper work on my existing AR-15 lower?
A: Absolutely. It’s designed for standard mil-spec AR-15 lowers. You’ll just need to ensure you use the dedicated .17 HMR bolt carrier group that comes with it, as the .223/5.56 BCG is not compatible.
Q: Is the .17 HMR cartridge powerful enough for coyotes?
A: That’s a debated topic. With perfect shot placement inside 150 yards, yes, it can be effective. However, it’s really in its prime on smaller varmints like prairie dogs, ground squirrels, and raccoons. For consistent, ethical coyote takedowns, most hunters would step up to a .223 or similar centerfire.
Q: What kind of optic should I put on this rifle?
A: To truly exploit the flat-shooting nature of the .17 HMR, a variable-power scope with adjustable parallax is ideal. Something in the 4-16x or 6-24x range from brands like Vortex, Leupold, or Athlon allows you to see and hit small targets at extended ranges clearly.
If the idea of a semi-auto laser beam for long-range rimfire work fits your needs, this Alexander Arms build is a seriously competent option. It’s available at firearms-missouri.com for Missouri residents and nationwide, and an FFL transfer is required for firearm purchases. Check availability and see if it’s the right tool for your range or field.
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