|300 AAC Blackout
|30 Remington AR
cartridges with 200 yard zero
The 308 Winchester hangs onto
velocity longer than any of the rounds listed on the table above, which means it
also has higher kinetic energy and bullets stay in the good graces of gravity
over a longer distance. The 223 Remington is an exception in that is
has minutely flatter
trajectory, however, the 308 Winchester carries 3 time the energy at
300 yards. Do the same numerical assessments have tactical, law
enforcement and personal security implications? I am sure they do,
however, I'll leave those assessment for someone more qualified in
The SR-762 is compact...
In the world of ARs, anything
chambered for the 308 Winchester or a 308 Winchester derivative
cartridge, generally is a lot more hefty than an AR-15 type. The
action and related subsystems have to be scaled to accommodate the
larger cartridge, which means it would require what an old Air Force
buddy of mine used to refer to as "mo' metal". In the case of the
Ruger SR-762, apparently the design resulted in a need for minimal
mo' metal. In terms of overall size, with the
stock fully extended, the SR-762 is only 2" longer than the
only 8 ounces heavier.
In terms of weight? Rather than
running for the plastic molded parts in an effort to reduce weight,
Ruger stuck with steel and aluminum where, and in the amounts,
required in a quality firearm. Some weight was saved with the
lightweight adjustable stock assembly on one end and through the use
of a 16.125" cold hammer
forged 41V45 alloy steel barrel on the other. Fluted and manganese phosphate
Parkerized on the outside, both the barrel's bore and chamber are chrome lined.
Smart to leave some things alone...
OK, let's pretend the photographs are
clear enough for everyone to see
the arrowed objects. The important point is that all of the controls are in the
same location as they would be on a MilSpec AR. So regardless which
AR wilderness you've wandered through to get here, all of those tactile
memories will apply... neurocognitively and haptically speaking. No,
I do not know what I just said but, no doubt, it is important.
Double flippin' rapid deploy sights...
The Ruger SR-762 is supplied with Samson flip up sights that speak to the quality of
every other aspect of this rifle. Front and rear, lock in both up
and down position. Unlike a lot of brands that have gone to some
form of poly, the Samson sights are made of 6061 aluminum, hard coat
anodized for durability and held in place with steel hardware. I put
a similar set on one of my house built ARs and the price tag made me
weep... but just a little. Good rifles need good sights.
The rear sight is adjustable for
windage, 1/2 MOA click and the front is adjustable for elevation
with the tool included with the SR-762, however, increment of
adjustment varies with distance between front and rear sights. The rear sight has rocker
selectable apertures, deployed with the large aperture (0.176") in
alignment, a flick of the thumb substitutes a small aperture
(0.069"). The front sight has an H&K type brush guard. For those
wanting more visibility, there are user installable Tritium and
Fiber Optic replacement front posts.
Psst... The operating system.
Ruger's description of the SR-762 as
a gas-operated, piston driven, box magazine fed, autoloading
rifle... which tells everyone that it is NOT an AR-15 type direct
impingement type firearm that pumps hot gases and powder residue out
of a small port, down a tube the length of the barrel and into a bolt
carrier key that sits atop the bolt carrier. The SR-762 bleeds gas
from the barrel, but uses it to drive a piston that actuates a
transfer rod that mechanically drives the rifle's bolt carrier.
Subsequently, there is only a flat contact pad on the bolt carrier
and no bolt carrier key... and a very clean assembly.
The Ruger's SR autoloading rifle gas blocks
are a bit
different than a conventional AR-15 gas blocks, even those that are
adjustable. Pictured assembled, that knurled knob on the end, the
regulator, can be turned to vary the size of the orifice that
presents itself to the gas port leading to the barrel's bore.
Removed from the rifle, the assembly, top to bottom is regulator
with regulator detent and, below it, the piston.
The regulator has 4 positions
numbered 0 - 3. Position "0" is no gas flow and the rifle will
function as a single shot with no gas flow to cycle the rifle's
action. Each successive number allow a freer flow of gas from the
barrel to the piston. Terrific for folks who change brands and types
of ammunition or who handload. Gas can be limited to the minimum
required to reliably cycle the firearm and save a lot of wear and
tear from overly aggressive cycling. Neat!
A few other details... Can't help it,
If you are familiar with an AR-10, or
one of its derivatives, the SR-762 will have a familiar feel. The
upper is hinged and locked down to its lower in the same fashion.
The charging handle and bolt carrier are removed in the same manner.
While the core of the SR-762 is an
original design and not a compilation of commodity parts, as is the
case with many AR type firearms, there is a good deal of accessory
compatibility. The SR-762 can use aftermarket buttstock assemblies,
hand grips, trigger assemblies, charging handles, magazines, and
compensators/flash hiders. A single, position marked, Picatinny rail
runs from receiver top to gas block. The floating handguard
is drilled and tapped to mount for accessory rails and accessories.
The SR-762 is supplied with 3
handguard grip panels, 2 accessory rails and all necessary hardware.
Also included are a sight adjusting tool, 3 PMAG 20 round magazines
and a really nice soft case that holds both firearm and accessories.
It's resting. It had a pretty busy day...
Today was cursory shooting, factory
ammunition day, but it was informative. As an example, I made the
comment that the rifle's bore volume, coupled with the 308
Winchesters moderate case capacity, was sufficient to minimize the
negative effect the 16.125" barrel would have on velocity. I shot
both Remington Express 150 grain ammo and similarly rated Hornady
150 grain ammo. Spec velocity is 2820 fps for the Remington ammo
from a 24" test barrel. The same load chronographed 2,742 fps from
the AR-762's 16.125" barrel, only a 78 fps difference with
approximately 8" less barrel. The Hornady ammo closed that
difference to 71 fps.
The SR-762 is probably the softest
shooting 308 Winchester I've worked with. Keeping the regulator
cranked down to the lowest reliably cycling setting, there only
minimal recoil. Double tapping rounds and keeping shots close
together was actually pretty easy with a bit of concentration to
brush off the report. I tried stock position in and out, and it was
comfortable shooting from either position. As far as accuracy goes,
the Ruger SR-762 is definitely a sub MOA rifle, short barrel and
all. Part 2 covers reliability of operation and live fire performance,
including chronograph and accuracy data.
Ruger's SR-762 308 Part 1
Ruger's SR-762 308 Part