The “AIR-GAUGED” Premium Barrel 3010CM7AIR is a Douglas 30 caliber 1-10 twist #7 chrome moly rifle barrel blank, engineered for shooters and gunsmiths who demand true match-grade performance. Built from 4140 chrome moly steel in a #7 medium-heavy contour, this .308 (30 caliber) air-gauged XX Premium barrel is designed to be the foundation of a seriously accurate custom rifle or high-end rebarrel job. LG Outdoors Website+2friscoguns.com+2
If you’re planning a precision .308-class build—from .308 Win and .30-06 to .300-based wildcats—the Douglas 3010CM7AIR “Air-Gauged” Premium Barrel gives you the kind of consistency and quality that serious long-range shooters look for.
Air-Gauged XX Premium – Douglas’s Highest Grade
Douglas “Air-Gauged” Premium barrels sit at the top of their lineup for a reason:
Every barrel is precision, instrument-inspected for straightness, then air-gauged for uniformity throughout the bore. Brownells UK+2Brownells UK+2
Land and groove dimensions are held to within about 0.0001" from breech to muzzle, dramatically tightening consistency over standard barrels. Primary Tactical+2brownells.lu+2
Only barrels that meet these strict criteria receive the Douglas “XX Premium” designation. Brownells UK+1
That level of inspection and tolerance control translates directly into better shot-to-shot consistency, helping your rifle hold tight groups as range and round count increase.
30 Caliber (.308) with 1:10 Twist – Ideal for a Wide Bullet Range
The 3010CM7AIR is built around the classic 30 caliber (.308") bore with a 1:10" twist rate: LG Outdoors Website+2friscoguns.com+2
A 1:10 twist is a proven, versatile choice for .30-cal cartridges, capable of stabilizing:
Common 150–180 grain hunting bullets in .308 Win and .30-06
Many match and long-range projectiles in the mid-to-heavy weight range
Typical .30-cal loads used for big-game hunting, precision target shooting, and tactical/precision applications
Whether you’re building a long-range hunting rifle, F-Class style gun, or precision steel rig, this twist rate offers excellent flexibility in bullet selection.
#7 Contour – Medium-Heavy for Stability & Heat Control
Contour matters—and the #7 contour on this Douglas blank is chosen for accuracy and practical field use: LG Outdoors Website+2friscoguns.com+2
Contour: #7 – a medium-heavy profile designed to resist whip and hold its POI as the barrel warms.
Retail specs list this barrel at roughly #7 weight and about 27.5" in length in its finished configuration, with some vendors offering extended 30" blanks. Primary Tactical+2friscoguns.com+2
Extra mass helps dampen barrel harmonics and provides better heat management during strings of fire.
For shooters who want more stability than a light sporter barrel—but don’t want to haul a full bull barrel into the field—#7 is a smart middle ground.
4140 Chrome Moly Steel – Strong & Finish-Friendly
The 3010CM7AIR is made from chrome moly steel, a classic and proven barrel material: LG Outdoors Website+2friscoguns.com+2
Material: 4140 chrome moly steel – tough, durable, and widely used in high-quality rifle barrels.
Takes traditional finishes well, such as hot bluing or Parkerizing, and also works great with modern coatings like Cerakote once all machining is complete.
Built for long service life under normal hunting and precision-shooting use with proper cleaning and maintenance.
If you like the feel and look of classic, high-quality steel barrels, this chrome moly blank is an excellent foundation.
Barrel Blank Configuration – Ready for Custom Gunsmithing
The “Air-Gauged” Premium Barrel 3010CM7AIR ships as a gunsmith-ready barrel blank, not a drop-in tube: Primary Tactical+2brownells.lu+2
Style: Air-Gauged XX Premium blank
Not chambered, not threaded, not crowned – your gunsmith will cut the shank, chamber, muzzle threads (if desired), and crown to your specs.
Offered as a #7 contour blank with marked muzzle end to indicate the tightest taper section for optimal accuracy. Primary Tactical
Suitable for a wide range of .30-caliber cartridges, including .308 Win, .30-06, .300 H&H, custom wildcats, and more (as long as pressures and dimensions are appropriate for the action and barrel).
That blank format gives you and your gunsmith maximum control over final length, chambering, and muzzle configuration.
Ideal Applications for the 3010CM7AIR “Air-Gauged” Premium Barrel
Thanks to its 30-caliber bore, 1:10 twist, and #7 contour, this Douglas barrel blank is an outstanding choice for:
Long-range hunting rifles – where first-shot precision and repeatable cold-bore performance matter.
Precision target and steel rifles – F-Class style builds, PRS-style training guns in .308, and other precision rigs.
Custom big-game rifles – where you need a balance of accuracy, manageable weight, and reliable terminal performance.
High-end rebarrel projects – upgrading a favorite action with a premium, air-gauged tube to tighten groups and extend effective range.
If your goal is sub-MOA or better performance and you’re pairing good gunsmithing with quality ammunition, this barrel has the pedigree to deliver.
Key Specifications – “AIR-GAUGED” Premium Barrel 3010CM7AIR
From Douglas/Brownells-style product listings: Primary Tactical+4LG Outdoors Website+4friscoguns.com+4
Manufacturer: Douglas
Model / MFR Part #: 3010CM7AIR
Product Name: “Air-Gauged” Premium Barrel
Caliber: 30 caliber (.308")
Twist Rate: 1:10"
Material: 4140 chrome moly steel
Contour: #7 (medium-heavy)
Style: Air-Gauged XX Premium barrel blank
Approx. Length: ~27.5" finished #7 contour (with some listings offering 30" x-long blanks)
Configuration: Unchambered, unthreaded, uncrowned barrel blank
Intended Use: Custom rifles, precision rebarrels, long-range hunting and target shooting
(Exact finished dimensions and weight will depend on how your gunsmith cuts and profiles the barrel.)
Why Choose the Douglas 3010CM7AIR “Air-Gauged” Premium Barrel?
You should consider this barrel blank if you:
Want a top-tier .30-caliber barrel with air-gauged XX Premium quality from a respected manufacturer.
Need a 1:10 twist that pairs well with a wide range of .308-class hunting and match bullets.
Prefer a #7 contour chrome moly blank that balances stiffness, heat control, and field carry weight.
Are working with a skilled gunsmith and want a barrel that can realistically support match-grade accuracy once properly chambered and fitted.
For gunsmiths, precision shooters, and serious hunters, the “AIR-GAUGED” Premium Barrel 3010CM7AIR – Douglas 30 Caliber 1-10 Twist #7 Chrome Moly is a proven, high-precision barrel blank that sets your next custom rifle up for success.
The End
