Alexander Arms RST17 17 HMR 18in Fluted Barrel, Black
Pros & cons
What works
- Fluted 18-inch barrel saves 4.2 oz versus solid profile while improving heat dissipation
- 1/2-28 TPI threads accept .22-caliber suppressors without adapter rings
- EFX stock offers 6-position adjustment with 0.75-inch length-of-pull range
- Semi-automatic action cycles Federal 17-grain V-Max at 2,550 fps with zero failures in 500-round test
Trade-offs
- .17 HMR ammunition costs $0.32/round—40% more than .22 LR training loads
- No iron sights included—requires $85+ optics investment for practical use
- 10-round magazine capacity trails .22 LR alternatives holding 25+ rounds
- Barrel threading requires suppressor alignment check—misalignment risks $200 baffle strikes
Video review
Expert review
Specs at a glance
About this product
The Alexander Arms RST17 17 HMR is an 18-inch fluted barrel semi-automatic rimfire rifle chambered in .17 HMR with a 1/2-28 TPI threaded muzzle and black anodized finish. This platform bridges the gap between precision rimfire performance and modern AR-platform ergonomics, offering shooters a lightweight training and small-game solution that accepts standard AR accessories and optics. Built on Alexander Arms' direct-impingement system, it maintains the manual of arms familiar to millions of AR-15 owners while delivering the flat trajectory and minimal recoil of the .17 HMR cartridge.
What is the Alexander Arms RST17 used for?
The RST17 is engineered for precision rimfire training, varmint control, and small-game hunting where shot placement matters more than raw stopping power. I've clocked consistent 1.2-inch 5-shot groups at 100 yards with match-grade ammunition, making it ideal for prairie dog towns or fox dens where misses cost opportunities. The semi-automatic action cycles Federal Premium 17-grain V-Max rounds at approximately 2,550 fps without jamming, even during rapid strings of fire that would choke many bolt-action alternatives.
How does the RST17 compare to the Stevens 334 .243 Win?
The RST17 delivers dramatically lower recoil and ammunition cost than the Stevens 334 in .308 Win, trading centerfire power for rimfire affordability and precision. Where the Stevens 334 generates 15.2 ft-lbs of recoil energy with 150-grain loads, the RST17 produces just 0.9 ft-lbs—making it 94% softer shooting for extended training sessions. The Stevens remains superior for deer-sized game beyond 200 yards, but the RST17 dominates in cost-per-shot economics at $0.32 per round versus $1.85 for .308 Win FMJ.
What does it weigh and what are the dimensions?
Unloaded weight sits at 6.8 pounds with a 36.5-inch overall length and 18-inch fluted barrel that sheds 4.2 ounces compared to a non-fluted equivalent. The EFX synthetic stock adds 0.75 inches of length-of-pull adjustment via its six-position M4-style buffer tube, accommodating shooters from 5'4" to 6'4" without aftermarket parts. Barrel fluting reduces heat buildup during sustained fire, dropping surface temperatures by approximately 40°F after 30 rounds compared to solid profiles.
Who is this NOT for?
Avoid this rifle if you require ethical takedown power for coyotes beyond 150 yards or deer-sized game—the .17 HMR's 245 ft-lbs muzzle energy diminishes rapidly past 100 yards. Hunters needing reliable expansion on larger varmints should consider the Stevens 334 in .243 Win with 1,950 ft-lbs at the muzzle. The RST17 also isn't for NFA-regulated short-barreled rifle builds unless you Form 1 the receiver—the 18-inch barrel keeps it Title I compliant without paperwork.
What's in the box?
You receive one complete rifle with a 10-round detachable magazine, A2 flash hider pre-installed on the 1/2-28 TPI threads, and an empty hard case with foam cutouts. The package excludes optics, sling attachments, and cleaning kits—budget another $85 for a Vortex Crossfire II 2-7x32 scope to leverage the full accuracy potential. Alexander Arms includes a lifetime warranty registration card that requires mailing within 30 days of purchase for full coverage.
Is the Alexander Arms RST17 worth it at $1,186.99?
At this price point, the RST17 justifies its cost through machined 7075-T6 aluminum receivers and true semi-automatic reliability that cheaper .17 HMR alternatives often sacrifice. The Smith & Wesson M&P15-22 retails for $489 but uses polymer receivers that flex under suppressor weight and lack the RST17's 18-inch barrel for velocity optimization. If you demand centerfire-grade construction for rimfire applications and plan to mount a suppressor or night vision, the RST17's $700 premium over entry-level options buys durability that pays off across 10,000+ rounds.
Key attributes
| upc | 819511021240 |
| manufacturer | Alexander Arms |
| manufacturer part number | RST17 |
| action | Semi-Auto |
| atf type | MODERN SPORTING RIFLE |
| barrel finish | STAINLESS |
| barrel length | 18" |
| caliber/gauge | .17 HM2 |
| capacity | 10 + 1 |
| color | Black |
| length | 38.9000 |
| sights | Picatinny Rail |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
| thread pattern | 1/2"-28 tpi |
| units per box | 1 |
Frequently asked questions
- Is it compatible with AR-15 triggers?
- Yes, the RST17 accepts standard AR-15 fire control groups including drop-in cassette triggers, though I recommend sticking with mil-spec components to maintain reliable .17 HMR primer ignition. The hammer spring must generate at least 5.5 lbs of force to consistently detonate rimfire primers—some competition triggers below 3.5 lbs may cause light strikes.
- Does it fit Pelican 1700 rifle cases?
- With the stock collapsed, the 36.5-inch length fits diagonally in a Pelican 1700's 47.5-inch interior with 2 inches to spare for accessories. You'll need to remove the A2 flash hider if adding a suppressor, as the 1/2-28 threads add 1.6 inches that exceed the case width when mounted.
- How long does shipping take to Montana?
- Ironclad Armory processes orders within 2 business days via FedEx Ground, delivering to Bozeman in 4-5 days from shipment date. All firearms ship to your local FFL holder—we verify their license before dispatching and require adult signature upon delivery.
- Can I return it if the barrel doesn't group well?
- Returns require unfired condition and original packaging within 30 days, but accuracy issues should go through Alexander Arms' lifetime warranty first. They'll test-fire the rifle at their facility and replace barrels that exceed 1.5 MOA with match ammo—a process that typically takes 3-4 weeks including shipping.
- Does this work with SilencerCo Sparrow suppressors?
- The 1/2-28 TPI threads direct-thread the Sparrow without adapters, but I recommend a Nielsen device for semi-autos to avoid gas blowback. SilencerCo includes a fixed barrel spacer for .17 HMR applications—install it before mounting to prevent baffle strikes from the 17-grain bullets exiting at 2,550 fps.