Tag Archives: Diamondback DB15

Alakablam

If you think an AR-15 pistol in 5.56 is kinda rowdy, how about an AR-10 in .308? I’ve been fooling about with one for the past few months (when I can get ammo).

Behold, the Diamondback DB10P, with a 13.5-inch barrel.

DB10

Equipped with an adjustable Gear Head Works Tailhook Mod 2 stabilizing brace, the DP10 is 31 inches long overall with the hook extended all the way and hits the scales at 7.8 pounds.

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Playing with Jelly

It is not rocket science. Longer barrels give you more complete propellant combustion which translates to more velocity imparted to the projectile. The more velo, the more energy is carried by the projectile on the impact and the higher ballistic performance. In short, whittle the barrel down and you sacrifice some performance. By way of thinking, the optimal performance for NATO 5.56mm ball, such as M855, is wrung through a 20-inch barrel.

With that in mind, I wanted to check and see just how much velocity dumped by running a 7-inch barrel out of a DB15 I have been testing for the past few weeks.

This thing.

For reference, the Winchester 55-grain 5.56 NATO FMJ rounds I chose for the bulk of our reliability testing have a listed 3,270 fps muzzle velocity generating 1,305 ft./lbs. muzzle energy. We found that, out of the 7-inch DB15, an average across five rounds hit closer to 2,240 fps, which, using the standard bullet energy formula, translates to something like 619 ft./lbs., or a loss of about a third of its velo and half of its energy.

How effective is that? Well, in 10% gel, the FBI recommends 12-to-18 inches of penetration to be considered an effective self-defense round. In our tests with a 16-inch block of Clear Ballistics 10% gel, I found that every round of a 7-shot test string of Winchester 55-grain FMJ penetrated the entire block and left a significant channel in its wake. 

Food for thought. Now to test some Gold Dots and the like to see how they expand.

An 8-pound pistol

So for the past few weeks, I have been fooling around with a T&E DB15 pistol. Featuring a 7-inch barrel, it is a fairly compact blaster and I have to admit that the KAK Flash Can and Gearhead Works Tailhook is growing on me.

While right out of the box, the 23-inch long 5.56 NATO handgun weighs just 4.53-pounds, I have added a Sig Sauer Romeo 5 red dot, a 600-lumen Streamlight and a Magpul D60 drum to it, bringing its loaded all-up weight with spare batteries (in the MOE grip) and boolits of 8.7-pounds.

Nice. For reference, the total cost as shown with all accessories is still under $1K. 

More in my column at Guns.com.