Rock River Arms Mid A4 .308 Win 16″ 20rd Black
Pros & cons
What works
- Weighs 8.5 lb — 1.2 lb lighter than a DPMS G2 Recon with similar features
- 16-inch barrel with 1:10 twist stabilizes 168-grain match ammo within 1.5 MOA
- Mid-length gas system reduces recoil by 15% compared to rifle-length systems in .308 ARs
- Includes Hogue grip and RRA stock — a $120 value if purchased separately
Trade-offs
- No ambidextrous controls — left-handed shooters must add a $80-120 safety selector
- Barrel heats up after 30 rounds rapid fire — requires cooling pauses for sustained accuracy
- Black finish scratches easily — cerakote refinishing adds $200-300 for durability
- Lacks iron sights — budget $150-300 for a quality optic or backup sights
Video review
Expert review
Specs at a glance
About this product
What is the Rock River Arms Mid A4 .308 Win 16" 20rd Black?
The Rock River Arms Mid A4 is a semi-automatic rifle chambered in .308 Win/7.62 NATO with a 16-inch barrel and mid-length gas system designed for reliable performance in practical shooting applications. Direct-gas impingement operation ensures consistent cycling with minimal maintenance, while the Hogue grip and RRA 6-position stock provide ergonomic control. Built on the AR-10 platform, it balances power and maneuverability for shooters who need a versatile .308 rifle without custom modifications.
What is the Rock River Arms Mid A4 used for?
This rifle is primarily used for medium-range target shooting, hunting, and tactical training scenarios where .308 Win ballistics are advantageous. The 16-inch barrel offers a compact profile for quick handling in confined spaces or vehicle use, while the 20-round capacity supports extended drills without frequent reloading. It's ideal for law enforcement, preppers, or hunters in wooded areas where shots under 300 yards are common.
How does the Rock River Arms Mid A4 compare to the Stevens 334 Rifle | .308 Win, 20in Matte Black Synthetic?
The Rock River Arms Mid A4 outperforms the Stevens 334 in rate of fire and customization potential due to its semi-automatic action and AR-platform compatibility. Unlike the bolt-action Stevens 334, the Mid A4 allows for rapid follow-up shots and accepts aftermarket triggers, handguards, and optics mounts with minimal gunsmithing. However, the Stevens 334 excels in accuracy for precision shooting, with a 20-inch barrel that adds 150 fps velocity over the Mid A4's 16-inch tube.
What does it weigh and what are the dimensions?
The rifle weighs 8.5 pounds unloaded and measures 36.5 inches in overall length with the stock collapsed. Barrel length is precisely 16 inches with a 1:10 twist rate, and the handguard spans 12 inches for ample accessory mounting space. This makes it 1.2 pounds heavier than a typical AR-15 but 4 inches shorter than most full-length .308 rifles like the compared here: DPMS G2 Recon.
Who is this NOT for?
This rifle is not for beginners due to its recoil, cost of .308 ammunition, and potential regulatory complexities in states with assault weapon bans. Shooters prioritizing sub-MOA accuracy or long-range precision beyond 600 yards should opt for a bolt-action like the the Stevens 334 .308 Win, as the semi-auto mechanism introduces slight grouping variations. It's also unsuitable for those needing a lightweight backpacking firearm, as the 8.5-pound weight exceeds many scout rifle benchmarks.
What's in the box?
The rifle ships with one 20-round PMAG, a Hogue rubber overmolded grip, and the RRA 6-position tactical carbine stock installed. No optics, sling, or cleaning kit are included, so budget an additional $200-$500 for essentials. The manual covers basic disassembly and warranty details, but lacks state-specific compliance guidance—consult our NFA blog post for clarity.
Is the Rock River Arms Mid A4 worth it at $1347.99?
At $1347.99, this rifle offers solid value for a semi-auto .308 with reputable components and out-of-the-box functionality. Compared to custom builds costing over $2000, it saves time and gunsmith fees while delivering reliable performance with military-spec 7.62 NATO ammunition. However, budget-conscious shooters might prefer a bolt-action like the Stevens 334 at half the price if they don't need rapid fire capability.
Key attributes
| upc | 842834103355 |
| manufacturer | Rock River Arms |
| manufacturer part number | 308A1239 |
| action | Semi-Auto |
| barrel length | 16" |
| caliber/gauge | .308 / 7.62 NATO |
| capacity | 20 |
| color | Black |
| model | Mid A4 |
| product type | AR |
Frequently asked questions
- Is it compatible with standard AR-10 magazines?
- Yes, it accepts any .308/7.62 NATO AR-10 pattern magazine, including Magpul PMAGs and Lancer L7AWM models. The included 20-round PMAG functions flawlessly, but avoid older DPMS-style mags which may require slight modification. Test with at least two magazine types during break-in to ensure reliability.
- Does it fit in a standard rifle case?
- Yes, it fits most 36-inch tactical cases when the stock is fully collapsed. For hard cases, aim for internal dimensions of 37x12x4 inches to accommodate optics or a suppressor. Our recommended Plano All-Weather case adds $129 but includes foam cutouts for accessories.
- How long does shipping take?
- Shipping takes 3-7 business days for in-stock items, plus 1-3 days for FFL processing. Expect delays of up to 14 days during peak seasons or if your FFL requires additional documentation. Contact support with your FFL's info to expedite.
- Can I return it if it doesn't cycle properly?
- Returns are accepted within 30 days for unfired rifles, but cycling issues often resolve after a 200-round break-in period. If malfunctions persist, Ironclad Armory covers gunsmith diagnostics under warranty—email videos of the failure to [email protected] within 90 days.
- Does this work with a .308 suppressor?
- Yes, the 5/8x24 threaded muzzle accepts most .308 suppressors like the SilencerCo Omega 300 or Dead Air Nomad-L. Threads are concentric and timed correctly, but always check alignment with a rod before firing. Suppressor use may require NFA paperwork and a 9-month wait for approval.