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New Year, New FREE GUN FRIDAY! Enter to WIN the Smith & Wesson and Black Hills package.

This Tricked-Out Sharps Bros. Jack10 Turns Heads at the Range

David Kenik by David Kenik
March 30, 2021
in Guns, Rifles
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Sharps Bros. Jack10 Rifle left profile
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Sharps Bros. Jack10 Rifle right profile
“I could not be more pleased with the finished build.”
Sharps Bros. Jack10 Rifle left profile
Sharps Bros. Jack10 Rifle right angle

Sharps Bros. Jack10 Rifle skull
An intricately detailed skull is CNC-machined into the Jack10 lower’s magazine well, providing a touch of style and slick reloads under stress. Also note the large integral triggerguard.
Sharps Bros. Jack10 Rifle barrel
The author outfitted his rifle with a 16-inch, Hanson-profile Premium barrel from Ballistic Advantage.
Sharps Bros. Jack10 Rifle trigger
WMD Guns’ lower parts kits come with nickel-boron-coated triggers, disconnects and hammers for smooth pulls and reliable shooting in virtually any condition.

Sharps Bros. Jack10 Rifle bcg
Note the nickel-boron-coated bolt carrier group from WMD Guns.
Sharps Bros. Jack10 Rifle reaction rod
The author used Geissele’s Reaction Rod to hold all of the upper assembly components, including the barrel and handguard, in place for easy installation.
Sharps Bros. Jack10 Rifle compensator
The S&J Customs Titan compensator helped reduce recoil.

Sharps Bros. Jack10 Rifle grip
The author chose an Ergo grip because of its ergonomic shape, subtle finger grooves and non-slip rubber construction.
Sharps Bros. Jack10 Rifle charging handle
For easy manipulations and added durability, the author installed one of Bravo Company’s tank-tough Gunfighter charging handles with a medium-sized latch.
The Ergo F93 Pro stock and 15-inch SLR Rifleworks 308H Helix KeyMod handguard make the Jack10 rifle infinitely modular to meet a variety of needs.

Sharps Bros. Jack10 Rifle handguard
Sharps Bros. Jack10 Rifle block
Sharps Bros. Jack10 Rifle lower block

Sharps Bros. Jack10 Rifle buffer

Let me start by saying that although I built this Sharps Bros. rifle purposely for a review, it was destined to be a keeper. Therefore, all of the components were carefully chosen for their quality and utility. Additionally, I wanted to make sure they enhanced the badass appearance of the Jack10 upper and lower receivers.

Sharps Bros. has become well known in the AR world for its otherworldly lower receivers. CNC-machined from billets of 7075-T6 aluminum, Sharps Bros.’ lowers have magazine wells that look like warthogs, fighter planes and, in the case of the Jack series, skulls. While the company started with 5.56mm NATO AR lowers, it has expanded to include AK-47 receivers and even .308 Winchester/7.62mm NATO AR receiver sets. Which brings us to the heart of this build—the Jack10.

  • RELATED STORY: Gun Test – Sharps Bros’ .458 SOCOM Rifle

The Sharps Bros. Jack10 kit features billet-crafted upper and lower receivers. The heavily flared magazine well looks like a skull with some awesome-looking details. Another nice addition is the integral, oversized triggerguard. The flattop upper is streamlined and angular like other billet-crafted receivers. Both of these parts are tank tough and, all together, weigh about 25 ounces. Now came the fun part of building the gun.

Ballistic Advantage

Sharps Bros. Jack10 Rifle barrel
The author outfitted his rifle with a 16-inch, Hanson-profile Premium barrel from Ballistic Advantage.

The barrel makes or breaks a rifle. If there is one area of a rifle not to skimp on, it’s the barrel. Looking to keep the build somewhat compact, I chose a 16-inch, Hanson-profile Premium series barrel from Ballistic Advantage. In addition to selling direct to enthusiasts, Ballistic Advantage is an OEM provider to many top rifle manufacturers. The company’s Premium barrels are made from 416R stainless steel and feature 11-degree, recessed target crowns. The Hanson profile eliminates all right-angle cuts to increase rigidity and strength without adding lots of additional weight. Each Hanson-profile barrels also comes with a low-profile gas block secured by a roll pin as well as dual Allen bolts. In other words, once installed, this gas block won’t budge. All Ballistic Advantage barrels are high-pressure (HP) and magnetic-particle (MP) tested and are backed by a sub-MOA guarantee.

I capped the barrel with an S&J Customs .308 Titan compensator. Available in black-oxided carbon steel or stainless steel, the Titan features eight exhaust ports designed to trap expanding gases in the baffles and increases dwell time for maximum efficiency. It is a very solid and well-machined device. S&J’s 5.56mm NATO compensator has a reputation for being one of the best on the market, so I expected comparable results from the company’s larger
.308 Winchester version.

Beyond The Barrel

Sharps Bros. Jack10 Rifle trigger
WMD Guns’ lower parts kits come with nickel-boron-coated triggers, disconnects and hammers for smooth pulls and reliable shooting in virtually any condition.

One of the most visual parts of a build is the handguard. Partial to the see-through aesthetic, I mounted a 15-inch 308H Helix KeyMod handguard from SLR Rifleworks. Its framework design is not only distinct and attractive, but lightweight as well. It weighs a scant 8.1 ounces. An interesting design feature is that only the rearward and forward portions of the top of the handguard are fitted with Picatinny rails. In addition to its visual appeal, this also reduces weight. I never use the middle portion on full-length rails, so it certainly won’t be missed. Made from 6061-T6 aluminum, the handguard includes a barrel nut that does not require timing and Grade 8 fasteners. The Helix is a free-floating, anti-rotational and anti-slip design finished with mil-spec hardcoat anodizing. SLR also offers an M-LOK version to those who desire that accessory-mounting platform.

The bolt carrier group that I chose is from WMD Guns. WMD’s claim to fame is its NiB-X coating. The company’s nickel-boron finish allows carbon and other fouling to be wiped off with a cloth. Yes, it’s that easy. Another advantage of WMD’s NiB-X is that it is permanently lubricious, which dramatically reduces the need for additional lubrication. Your gun will run more reliably and for longer periods of time.

Once you clean a WMD Guns bolt carrier group, you will want to switch out the bolt carrier groups on all of your other rifles, which is exactly what I did.

Lower Details

The Ergo F93 Pro stock and 15-inch SLR Rifleworks 308H Helix KeyMod handguard make the Jack10 rifle infinitely modular to meet a variety of needs.

I also installed WMD’s lower parts. The kit comes complete with all of the lower parts except the pistol grip; the trigger, disconnect and hammer are all NiB-X coated. Again, this finish minimizes friction and wear and reduces the need for lubrication and cleaning. The nickel-boron coating’s inherent lubricity greatly smoothens out the trigger pull as well.

For a buttstock, I added an Ergo F93 Pro and attached it to the Sharps Bros. lower receiver. The F93’s eight length-of-pull positions make it highly adjustable, and when fully extended, it offers one of the longest length of pulls on the market. The stock is built around an incorporated carbine-length buffer tube and includes a standard castle nut as well as an ambidextrous sling plate. The cheekpiece remains fixed for a constant and repeatable cheekweld in any position. I especially like that the F93 feels as sturdy as a fixed stock.

  • RELATED STORY: 10 ‘Upper Class’ Lower Receivers For Your Rifle

The pistol grip that I installed is also from Ergo Grips. It’s the company’s flagship product and one my favorite grips because of its comfortable shape, subtle finger grooves and easy-to-grip, non-slip rubber construction.

The buffer and buffer spring are from Slash’s Heavy Buffers. Weighing in at 8.5 ounces—about 3 ounces heavier than others on the market—the XH Rifle buffer is constructed of 303 stainless steel and has a sliding tungsten anti-bounce counterweight. The primary benefit of the buffer’s heavier-than-standard weight is that it reduces felt recoil. With a suppressed rifle, it also helps mitigate the effects of overpressure.

Finally, I chose a Bravo Company Manufacturing (BCM) Gunfighter charging handle because I find that its extended handle size makes the task of charging the rifle much easier. I have installed these charging handles on all of my rifles. Available with small, medium and large handles, I favor the medium version because it adds a larger gripping surface, but its not so large that it gets tangled up in other gear that I am wearing.

Sharps Bros. Jack10 Assembly

Sharps Bros. Jack10 Rifle reaction rod
The author used Geissele’s Reaction Rod to hold all of the upper assembly components, including the barrel and handguard, in place for easy installation.

I assembled the upper using Geissele Automatics’ AR-10/SR-25 Reaction Rod. With the rod mounted in a vise, either horizontally or vertically, the upper receiver can easily slide over the rod. The rod’s integral splines enter the barrel extension and secure the barrel extension from turning. Also available in a 5.56mm NATO version, the Reaction Rod makes the installation of barrel nuts, gas blocks, handguards and muzzle devices easy, and it eliminates torqued receivers, distorted index pins or damaged finishes, all of which can be caused by using some of the receiver blocks common today.

For the lower receiver assembly, I used a Brownells 308 AR Lower Receiver Vise Block to lock the receiver in place. Installing the components is much easier with the receiver held in place with the block. Made from Delrin polymer, this device will not mar or scratch the receiver’s finish.

I could not be more pleased with the finished build. The rifle functions flawlessly and achieved a best group of 0.6 inches at 100 yards with Black Hills ammunition. The S&J Customs Titan brake did its job reducing felt recoil, and I have to admit that the Sharps Bros. Jack10 rifle certainly turns heads at the range!

Caliber: 7.62mm NATO

Barrel: 16 inches

OA Length: 34-37 inches

Weight: 8 pounds (empty)

Stock: Ergo F93

Sights: Flip-up front and rear

Action: Direct impingement semi-auto

Finish: Matte black

Capacity: 20+1

MSRP: N/A

For More Information

Ballistic Advantage
ballisticadvantage.com

Bravo Company
bravocompanymfg.com

Brownells
brownells.com

Ergo Grips
ergogrips.net

Geissele
geissele.com

Sharps Bros.
sharpsbros.com

S&J Customs
stores.sjcguns.com

Slash’s Heavy Buffers
heavybuffers.com

SLR Rifleworks
slrrifleworks.com

WMD Guns
wmdguns.com

This article was originally published in ‘Gun Buyer’s Guide’ 2017. To order a copy, visit outdoorgroupstore.com.

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