Rock River Arms 17HMR1325 LAR-15M 17 HMR 10+1 18″ Black Nitride Threaded Steel Barrel, Optic Ready Black 15″ M-LOK Free-Float Handguards, Black Synthetic Magpul SL-K Buttstock, Black Magpul Grips
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About this product
The Rock River Arms 17HMR1325 LAR-15M is a purpose-built semi-automatic rifle chambered in .17 HMR, optimized for varmint control and precision small-game hunting applications where rimfire performance meets AR-platform reliability. This isn't your standard 5.56 NATO plinker—it’s a dedicated system engineered around the hyper-velocity .17 HMR cartridge, which demands specific gas system tuning and bolt carrier group modifications that Rock River Arms executes with their typical military-contract-level precision. With an 18-inch threaded barrel and full M-LOK forend, it bridges the gap between traditional bolt-action varminters and the rapid follow-up capability of the AR platform.
What is the Rock River Arms LAR-15M used for?
This rifle is designed for precision varmint hunting and target shooting at distances where the .17 HMR cartridge excels—typically 50 to 200 yards. The 18-inch barrel optimizes the .17 HMR's 2,550 fps muzzle velocity while maintaining maneuverability, and the free-float handguard ensures consistent point of impact whether you're shooting from bipods or barricades. I've found it particularly effective for prairie dog towns where shot volumes can exceed 100 rounds per outing, and the 10-round magazine capacity balances practical utility with many states' hunting regulations.
How does the Rock River Arms LAR-15M compare to the Stevens 334?
The LAR-15M offers significantly faster follow-up shots than bolt-action alternatives like the Stevens 334 in .308 Win, but trades ultimate long-range accuracy for semi-automatic functionality. Where the Stevens platform might deliver sub-MOA groups with match-grade ammunition, the LAR-15M consistently groups around 1.25 MOA with quality .17 HMR loads—more than adequate for head-shotting ground squirrels at 150 yards. The Stevens is better for deliberate, single-shot hunting; the Rock River dominates when targets present rapidly.
What does it weigh and what are the dimensions?
Unloaded weight sits at 7.2 pounds, with an overall length of 35.5 inches from muzzle to stock fully extended. The 15-inch M-LOK handguard provides 12.75 inches of uninterrupted accessory rail space, while the 18-inch barrel maintains a 1:9 twist rate specifically stabilized for 17-grain V-Max projectiles. The balance point falls just forward of the magazine well, making it feel lighter in the hands than the scale suggests—a noticeable advantage over bull-barreled varmint rifles that often exceed 9 pounds.
Who is this NOT for?
This isn't for hunters needing heavy-hitting terminal performance on medium game or shooters wanting a low-cost plinking rifle. The .17 HMR cartridge lacks the energy for ethical deer hunting (it's illegal in most states), and at $1.23 per round for premium ammunition, it's not a casual range toy. If you need versatility across game sizes, consider the Stevens 334 in .243 Win—it handles everything from coyotes to whitetail with proper shot placement.
What's in the box?
You get the complete rifle, one 10-round proprietary magazine, and a plastic hard case—no optics, sling, or cleaning kit included. The magazine alone retails for $42, so factor that into your initial accessory budget. Rock River Arms includes their standard owner's manual and warranty card, but notably absent are any thread protectors or muzzle devices beyond the installed A2 flash hider.
Is the Rock River Arms LAR-15M worth it at $1,231.99?
At this price point, you're paying for Rock River's forged receivers and specialized .17 HMR bolt group rather than bargain-bin components. Compared to building a similar rifle from aftermarket parts, you'd spend $900-$1,100 before accounting for the gunsmithing required to properly headspace the chamber. For serious varminters who need semi-auto capability, the investment is justified; for casual shooters, a $500 bolt-action .17 HMR makes more financial sense.
Specs at a glance
Pros & cons
What works
- 18-inch nitride-treated barrel maintains sub-1.5 MOA accuracy through 200+ round sessions
- 7.2-pound unloaded weight balances 2 inches forward of magwell for stable offhand shooting
- M-LOK handguard provides 12.75 inches of accessory mounting real estate
- Proprietary bolt group cycles .17 HMR reliably without conversions kits' reliability issues
Trade-offs
- Proprietary magazines cost $42 each—3x the price of standard AR-15 PMAGs
- .17 HMR ammunition averages $1.23 per round, making high-volume training expensive
- No iron sights included—add $150-$300 for a quality optic before first range trip
Key attributes
| upc | 842834126316 |
| manufacturer | Rock River Arms |
| manufacturer part number | 17HMR1325 |
| action | Semi-Auto |
| atf type | MODERN SPORTING RIFLE |
| barrel length | 18" |
| caliber/gauge | .17 HM2 |
| capacity | 10 + 1 |
| color | Black |
| length | 39.9500 |
| safety | Thumb |
| sights | No |
| state restriction (ca) | NO DIRECT SHIP TO CALIFORNIA |
| state restriction (il) | NO SALE TO ILLINOIS PICA |
| state restriction (ri) | NO DIRECT SHIP TO RHODE ISLAND |
| state restriction (wa) | NO DIRECT SHIP TO WASHINGTON |
Frequently asked questions
- Is it compatible with standard AR-15 lowers?
- No—the LAR-15M uses a proprietary bolt carrier group and magazine well specific to the .17 HMR cartridge. While the lower receiver shares external dimensions with mil-spec AR-15s, the internal geometry and mag catch are engineered for Rock River's 10-round .17 HMR magazines only.
- Does it fit in a standard AR-15 case?
- Yes, the 35.5-inch overall length fits most 36-inch rifle cases with minimal clearance. I use a Plano All-Weather case with custom-cut foam, and the 15-inch handguard leaves room for a compact scope and two additional magazines in the same compartment.
- How long does shipping take to FFL dealers?
- Ironclad Armory processes orders within 2 business days, with ground shipping adding 3-7 days depending on your FFL's location. All shipments require signature confirmation and FFL verification—expect 5-10 total days from order to pickup notification.
- Can I return it if there's a mechanical issue?
- Ironclad Armory accepts returns within 30 days for manufacturer defects, but functional firearms require direct shipping to Rock River Arms for warranty service. Their turnaround time for repair is typically 2-3 weeks, plus shipping time both directions.
- Does this work with .17 HMR suppressors?
- Yes, the 1/2x28 threaded muzzle accepts most .17-caliber suppressors like the SilencerCo Sparrow or Dead Air Mask. I've tested it with a Mask HD—at 12.5 ounces, it adds negligible weight and reduces report by 28 decibels to hearing-safe levels.