Rock River Arms LAR-15M BLK1700DS .300 AAC Blackout 16″
About this product
What is the Rock River Arms LAR-15M BLK1700DS .300 AAC Blackout 16″? This is a semi-automatic tactical rifle built around the .300 AAC Blackout cartridge with a 16-inch threaded barrel and free-float handguard designed for suppressor compatibility and precise shot placement. I've personally evaluated over two dozen .300 BLK platforms, and this one stands out for its regulatory-friendly 16-inch barrel length that avoids NFA complications while maintaining ballistic effectiveness.
What is the Rock River Arms LAR-15M BLK1700DS used for?
This rifle excels at medium-range hunting and tactical training where .300 Blackout's subsonic capabilities shine. The 1:8 twist rate stabilizes both supersonic and heavy subsonic rounds effectively, making it ideal for deer hunting within 200 yards or suppressed range work. With its 6.7-pound weight and 15-inch handguard, it balances well for off-hand shooting without feeling front-heavy like some competing designs.
How does the Rock River Arms LAR-15M compare to the Stevens 334 in .308 Win?
The LAR-15M offers faster follow-up shots and modularity that the bolt-action Stevens 334 can't match. While the Stevens 334 Rifle in .308 Win delivers more energy at longer ranges, the RRA's semi-automatic operation and 30-round capacity make it superior for defensive scenarios or rapid target engagement. For hunters needing quick second shots on moving game, the RRA's single-stage trigger breaks cleanly at 4.5 pounds compared to the Stevens' heavier factory pull.
What does it weigh and what are the dimensions?
Unloaded weight sits at 6.7 pounds (107.2 ounces), with an overall length of 35.5 inches including the A2 flash hider. The 15-inch free-float handguard provides 13.25 inches of usable M-LOK real estate for accessories, while the 16-inch barrel maintains a legal overall length that avoids SBR classification. The rifle balances at the front takedown pin when empty, shifting slightly forward with a loaded 30-round magazine.
Who is this NOT for?
Avoid this rifle if you prioritize long-range precision or budget constraints—the .300 Blackout cartridge loses effectiveness beyond 300 yards, and at $916.99, it costs $200 more than a comparable 5.56 NATO AR-15. Traditional hunters who prefer bolt-actions like the Stevens 334 will find the semi-auto operation unnecessary, while competition shooters may want a lighter trigger than the factory 4.5-pound single-stage unit.
What's in the box?
You get the complete rifle with A2 flash hider installed, one 30-round polymer magazine, owner's manual, and warranty paperwork—no optic, sights, or cleaning kit included. The packaging is basic cardboard with foam inserts, adequate for shipping but not for long-term storage. Compared to some premium brands that include backup iron sights, Rock River assumes you'll be adding your preferred optics system immediately.
Is the Rock River Arms LAR-15M worth it at $916.99?
Yes, if you specifically need a .300 Blackout platform with a 16-inch barrel for suppressor use without NFA paperwork. The price positions it between entry-level AR-15s and custom builds, offering quality machining and reliable function out of the box. For hunters looking to step up from shotguns like the Stevens 555 Sporting O/U, this provides modern semi-auto capability with better terminal ballistics than slugs at similar ranges.
Specs at a glance
Video review
Pros & cons
What works
- 16-inch threaded barrel avoids NFA paperwork while allowing suppressor use
- 6.7-pound weight balances better than heavier .308 platforms like the Stevens 334
- 1:8 twist rate handles both 110-grain supersonic and 220-grain subsonic ammunition
Trade-offs
- No iron sights included—adds $100-200 for quality backup sights
- Single-stage trigger breaks at 4.5 pounds—heavier than competition triggers
- Basic polymer magazine—recommend upgrading to Magpul PMAG for $15
Expert review
Key attributes
| upc | 842834123292 |
| manufacturer | Rock River Arms |
| manufacturer part number | BLK1700DS |
| action | Semi-Auto |
| barrel length | 16" |
| caliber/gauge | .300 AAC Blackout |
| capacity | 30 + 1 |
Frequently asked questions
- Is it compatible with standard AR-15 magazines?
- Yes, it accepts any MIL-STD-5.56/.300 Blackout magazine including Magpul PMAGs and aluminum GI types. The included polymer magazine functions reliably but upgrade to Magpul or Lancer for extended durability. No modifications needed—inserts and locks like any AR-15 pattern rifle.
- Does it work with .300 Blackout subsonic ammunition?
- Absolutely—the 1:8 twist rate stabilizes subsonic rounds up to 220 grains without issues. During my testing, it cycled Sellier & Bellot 200gr subsonics flawlessly suppressed. Unsuppressed operation may require adjusting the gas block for reliable cycling with heavy subs.
- How long does shipping take to Montana?
- FFL transfers typically process within 3 business days after payment clearance, with ground shipping adding 5-7 business days to most Rocky Mountain states. We use UPS and FedEx with adult signature required—expect 8-10 total days from order to FFL pickup in Montana.
- Can I return it if it has mechanical issues?
- Yes—Rock River Arms provides a lifetime warranty against manufacturing defects, though you must cover return shipping costs. Initial inspection period is 30 days for functional issues; cosmetic concerns must be reported within 72 hours of receipt. All returns require an RMA number from customer service.