The Perfect Balance of Size and Performance
Paired with a lower power buffer spring + H2 Buffer, this is one of the softest shooting uppers we have every built.
By using a 10.3″ barrel (which is a bit longer than your standard 7.5″ AR pistol), we can achieve a good balance of performance, weight, and power.
A standard 55gr 556 round coming out of a 10.3″ barrel still has velocities around ~2,800fps which can be usable in many defensive cases.
What you get is a compact, light weight package with power behind it. The perfect in-between size between a “rifle” and a “pistol”.
With our 9″ M-LOK Handguard, you have plenty of space to mount accessories, lasers, flashlights, and more!
We had to do a bit of “custom” work in order to make the gas block work with this handguard. Just had to cut a notch out to make room for the gas adjustment screw.
Components List
- 10.3″ Spiral Fluted 556 TiN Coated, Polished Barrel
- SureFire Socom Brake
- Clamp On, 2 Piece JP Enterprises Adjustable Gas Block
- Black Nitride Carbine Length Gas Tube
- RED Anti-Rotation Insert
- SLR Helix 7075 Handguard 9″
- KTactical BAT Ambidextrous Charging Handle
- Gold Color Standard Weight, Highly Polished 556 BCG (Exact manufacturer may vary due to supply limitations but we will offer an equal or higher value BCG in the kit ~$250 – $350)
- KTactical AR Billet Upper Receiver 7075
- Assembly, Test Firing
How to achieve Maximum Reliability
For our build, you will want to make sure you use these settings. The gas block will already be tuned before it is shipped out.
- Standard Weight BCG
- H2 Buffer (sold separately)
- Low Power Buffer Spring (sold separately)
- Gas Block: 32 – 40 Clicks Opened
Our company has been specializing in AR pistols and short builds for several years now.
We have been testing and tuning these types of builds for maximum reliability. So while you may see YouTube videos of gun guys saying how 10″ AR-15’s are “unreliable” we think you will find our specific setup to be very reliable.
Additionally, the use of a low power buffer spring + H2 buffer means less wear and tear on the internal parts.
Use These for Maximum Reliability:
Do these come Fully Assembled?
The upper receiver comes fully assembled (according to the kit that your ordered).
However, the lower parts and other accessories will need to be assembled by the end user (assuming your kit includes any lower parts such as: trigger, buffer, spring, etc.)
Does it need to be shipped to an FFL?
These kits do NOT contain any parts that require shipment to an FFL.
There are some shipping restrictions to certain states and cities which can be checked at checkout when entering your zip code, and depending on which kit you selected.
Are these test fired?
Yes. All of our uppers are test fired and function tested before they are shipped out. No upper leaves our warehouse without a seal of approval!
If you notice any signs of use on your upper, this is most likely due to the test firing.
We do our best to clean up after test firing, but there may be some marks on the charging handle, brake, and inner components from the test firing process.
Rest assured that your upper is considered in “brand new” condition when it is shipped out and that test firing is a necessary part of the upper completion process.
What ammo does this take? 556 or 223?
The 556 chambering will allow for the safe use of both .223 Remington and 5.56 NATO ammunition.
Is the Gas Block Adjustable?
The gas block can be easily adjusted without taking off the rail, by accessing the hex screw located on the side of the gas block using a hex tool.
Under most circumstances, the end user will not need to adjust the gas block.
However, if they plan to use specialized ammunition or a muzzle device which requires lower gas pressure, then the convenient option to adjust the gas block from the side is always available.
Ideal gas block adjustment is 32 – 40 clicks opened while using a H2 Buffer and Low Power Spring.
What Gas Block Settings Should I Use?
The gas block can be easily adjusted without taking off the rail, by accessing the hex screw located on the side of the gas block using a hex tool.
This is a 10.3″ barrel with a CARBINE length gas system. Our upper comes with an adjustable gas block that “clicks” after every turn.
We use the number of clicks from fully closed or “0” to determine the right value.
For our 10.3 Build:
- Standard Weight 556 BCG
- H2 Buffer
- Low Power Buffer Spring
- Gas Block: JP Enterprises Adjustable Clamp On
- Gas Block Setting: 32 – 40 Clicks Opened
When using Federal 223 55gr ammunition, we found the best setting was 35 clicks opened.
What are the size specifications?
Specifications on the size, assuming only parts used from our kit:
- Barrel Length: 10.3 inches
- Recommended Gun Bag Size: 28 inches and above
What gun bag will this fit?
We recommend using this 28″ SBR Bag from Evolution Outdoor:
Is there a Warranty?
We stand behind our product! No upper is shipped without a thorough and complete test fire and documentation.
However, if any issue arises that we determine to be the fault of our assembly or failure of the included parts, please do not hesitate to reach out to us to discuss several options such as:
- Return
- Repair / Replacement
- Possible Fix
In some cases, the unit may not be functioning properly due to user error, such as improperly tuning the gas block, using the wrong buffer or buffer spring, using over pressured ammo, or having lower parts that are not compatible with the desired function.
If the malfunction or damage is caused by faulty ammo, we suggest your best course of action to contact the ammo manufacturer.
If the issue is related to any of the included accessories, such as the optic or peripheral accessories malfunctioning, you should be able to get a replacement unit directly from the manufacturer, but you can also reach out to us if you are uncertain about what to do.
For all other inquiries or if you’re just not sure if something is working right, feel free to reach out to us here.
⚠️ WARNING
Misuse could cause serious injury or even death. Have a licensed gunsmith set up this product. We will not be held liable for any injury, damage of property, direct and/or incidental damages, loss of health, death, or any other damage as a result of using this product or included components. Small parts, choking hazard: keep out of reach of children. Not suitable for anyone under 18 years of age.
WARNING: Cancer and Reproductive Harm – www.P65Warnings.ca.gov.
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