December 31st, 2014

Patriotic Pistol-Caliber Carbine Give-Away

Are you feeling lucky on this last day of 2014? Well Cheaper Than Dirt is giving away a very unique (and very patriotic) rifle. The Just Right Carbine is a simple, blowback-action semi-auto rifle that can be configured to shoot three different pistol cartridges: 9mm, .40 SW, and .45 ACP. The Just Right Carbine bridges the power gap between long guns chambered for rimfire cartridges and those using full-power rifle rounds. With caliber conversion kits, this modular carbine can shoot the three most popular semi-auto pistol cartridges: 9mm, .40 SW, and .45 ACP. The give-away rifle is configured to shoot one caliber, the 9mm Luger (9mm parabellum).

Just Right Carbine

This special-release Stars and Strips Edition carbine is finished in an American Flag camouflage. American Rifleman magazine says this rifle is versatile and easy to operate:

“At first glance, the JR Carbine is just another AR variant. Though it shares numerous parts and an outward appearance with the ubiquitous AR platform, the JR is actually of a totally different design. Unlike the AR’s gas-operated action, the JR Carbine uses a simple blowback system similar to that of the Ruger 10/22. The bolt is held forward by spring pressure and is cycled by the energy of the fired round; there are no gas tubes or pistons involved. While it doesn’t use the AR’s operating system, the JR Carbine does share with the AR its modularity and some parts commonality, so many of the myriad of AR accessories can be used on the JR. The carbine uses a standard commercial diameter AR buffer tube so any buttstock compatible with a commercial AR can be fitted to the JR. Mil-spec and commercial AR parts are also interchangeable with the carbine’s AR-style trigger, grip, and safety[.]”

Just Right Carbine

How to Enter Contest: For a chance to win this rifle, visit the Cheaper Than Dirt Contest Registration Page and complete the online entry form. Limit one entry per person and e-mail address during the Sweepstakes Period.

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November 12th, 2014

Zediker Writes about Long Range Shooting with the AR-15

Looking to shoot an AR-platform rifle out past 500 yards? Then you should read two recent articles by AR guru Glen Zediker. Author of The New Competitive AR-15 and The Competitive AR15 Builders Guide, Zediker is an expert when it comes to AR-platform rifles — he knows as much as any guy around. Glen believes ARs have excellent long-range capability, provided they are built to high standards, with good barrels. Glen says: “a properly configured AR-15 is easily capable of good performance at 500+ yards. Good performance means it can hit a 1-foot-square target all the time. Competitive shooters can cut that standard in nearly half (the X-Ring on an MR1 600-yard NRA High Power Rifle target is 6 inches, and high X-counts are commonplace among more skilled shooters).”

Published in the Cheaper than Dirt Shooter’s Log, Zediker’s pair of articles cover the history and upgrading of the AR-15. Part One reviews the AR’s development as an accurate firearm, tracing its evolution from a Vietnam-era combat weapon to what is now a favored target rifle of High Power competitors. READ PART ONE.

Long Range AR AR-15 Glen Zediker Cheaper than dirt

Part Two discusses the specifics that make an AR accurate at 500 yards and beyond. Zediker talks about barrel configuration (profile and twist rate), bullet selection, floating handguards, and proper mounting of optics or iron sights. READ PART TWO.

Long Rang AR AR-15 Glen Zediker Cheaper than dirt

Here are some highlights from Long-Range AR-15 Part TWO:

Barrel Twist Rate
To stabilize anything longer than a 68- or 69-grain bullet, the barrel twist rate must be — at minimum– 1-in-8. Twist rates reflect how far the bullet travels along the lands or rifling to make one complete revolution. So, 1-in-8 (or 1-8, 1:8) means “one turn in eight inches.” I think it’s better to go a little faster in twist. There is nothing wrong with a 1:7 twist. The 90-grain bullets require a 1:6.5, and that is getting on the quick side. If you want to shoot Sierra 77s or equivalent, and certainly anything longer, 1:8 is necessary. By the way, it is bullet length, not weight, which constitutes the necessary twist rate to launch a stable bullet.

Optics Mounting
Correct optical sight positioning can be a challenge. With a flattop upper, I need a good inch additional forward extension at the muzzle side of the upper for the sight mount bases to avoid holding my head “back” to get the optimal view through the scope. A longer rail piece is necessary for my builds as a result.

Buttstock Length and Adjustment
An adjustable buttstock is valuable, and even more valuable if it’s well-designed. Mostly, a standard stock is too short, and the cheek area sits too low. Adding length helps a lot by itself. There are assemblies that replace the standard buttplate to allow for length and, usually, height and rotation adjustments for the buttpad. An elevation-adjustable cheekpiece is a big help to attain a solid position.

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