PROOF Research AR-Style Barrel — 300 Blackout, 16" | Carbine Gas | 1:8" Twist | 5 Grooves | 5/8-24 TPI | Carbon Fiber Wrapped | SKU 100561 | UPC 843068100561
Build a lighter, quieter, and more accurate 300 BLK carbine. The PROOF Research 16" Carbon Fiber–Wrapped 300 Blackout Barrel pairs a match-grade stainless core with a proprietary carbon wrap to deliver heavy-barrel precision without the front-end weight. Tuned with a carbine-length gas system, a 1:8" twist, and 5-groove rifling, this barrel is optimized for both subsonic/suppressed and supersonic loads—so you can ring steel at distance, or run quiet and flat with heavy bullets.
Why Choose a PROOF Carbon Fiber Barrel for 300 BLK?
Heavy-contour accuracy, half the weight: Carbon fiber dramatically improves stiffness-to-weight, giving you bolt-gun-like POI consistency in a quick-handling AR.
Runs cooler, holds zero: The wrap enhances heat dissipation and dampens barrel harmonics to reduce POI shift during longer strings—great for training days and hog hunts.
Subsonic + supersonic friendly: The 1:8" twist stabilizes common 300 BLK bullets—from light 110–125 gr supersonics to heavy 190–220+ gr subs used with suppressors.
Smooth cycling: Carbine-length gas balances reliability and recoil impulse across a wide range of factory loads, suppressed or unsuppressed.
Threaded for today’s devices: Standard 5/8-24 tpi muzzle threads accept most brakes, flash hiders, and direct-thread or QD suppressor mounts.
Key Features at a Glance
Caliber: 300 AAC Blackout
Length: 16 inches
Gas System: Carbine length
Rifling: 5 grooves, 1:8" twist (subs & supers)
Muzzle Threads: 5/8-24 tpi
Construction: Match-grade stainless steel core + carbon fiber wrap
Platform: AR-15 pattern upper receivers (300 BLK)
Crown/Chamber: Precision-cut for repeatable accuracy
SKU: 100561 | UPC: 843068100561
Real Advantages You’ll Feel
Faster target transitions: Less muzzle weight = quicker indexing in and out of positions, vehicles, and barricades.
Better balance: A lively front end makes offhand shots steadier and reduces shooter fatigue on long patrols or hikes.
Cleaner recoil impulse: 300 BLK’s gentle push + carbine gas + proper mass = flat, trackable sights and easy follow-ups.
Suppressed performance: Consistent dwell and rigid construction help maintain zero and reduce gassy behavior when running cans.
Ideal Use Cases
Suppressed carbines for hunting, ranch work, and training
Home/vehicle defense builds needing compact handling with reliable cycling
Range & steel with both subsonic and supersonic loads
Lightweight field rifles where every ounce counts
Installation & Tuning Tips
Verify pattern: This is an AR-15 300 BLK barrel (not AR-10). Confirm receiver compatibility and gas-block journal size.
Gas block & tube: Use a low-profile gas block and carbine-length tube aligned perfectly over the port. Consider an adjustable gas block for suppressed tuning.
Headspace matters: Pair with a quality .300 BLK bolt (5.56 BCG/bolt carrier; Blackout-specific chamber). Check headspace.
Muzzle device: Install your brake/flash hider or suppressor mount to 5/8-24 spec with the manufacturer’s torque and timing guidance.
Break-in & zero: The match core is hand-lapped; a short break-in and load confirmation will help lock down your final POI.
Ammo Guidance
Supersonic: 110–125 gr for flatter trajectories and energy on target.
Subsonic: 190–220+ gr for quiet, stable flight through suppressors—1:8" twist supports common heavy bullets.
Care & Maintenance
Clean as you would a premium stainless match barrel; avoid steel tools that can mar the crown.
Maintain sane heat cycles—carbon fiber helps, but good heat discipline preserves peak accuracy.
Periodically verify muzzle device torque and suppressor mount alignment.
Specifications
| Attribute | Detail |
|---|
| Caliber | 300 AAC Blackout |
| Barrel Length | 16" |
| Gas System | Carbine length |
| Rifling | 5 grooves |
| Twist Rate | 1:8" |
| Muzzle Threads | 5/8-24 tpi |
| Core | Match-grade stainless steel |
| Wrap | Carbon fiber |
| Platform | AR-15 pattern |
| SKU | 100561 |
| UPC | 843068100561 |
Compatibility Notes
Designed for AR-15 300 BLK uppers.
Works with standard 5.56-size BCG/carrier; use a 300 BLK chambered barrel (this unit) and 300 BLK ammo only.
Ensure your handguard length and gas block clear the carbon wrap and permit proper ventilation.
SEO Highlights (for Merchandising & Search)
PROOF Research 300 Blackout barrel 16", carbon fiber AR-15 barrel, carbine gas 300 BLK barrel, 1:8 twist 5-groove 300 AAC, 5/8x24 threaded 300 Blackout, lightweight match barrel for suppressor, PROOF 100561, UPC 843068100561, carbon fiber wrapped 300 BLK barrel.
Go lighter, run cooler, and shoot tighter—equip your AR-15 with the PROOF Research 16" Carbon Fiber–Wrapped 300 Blackout barrel and unlock premium suppressed and unsuppressed performance.
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