Blue Titanium 16″ Unassembled Upper Build Kit – 15″ M-lok
$204.95
Unassembled 16″ 5.56 NATO AR rifle upper build kit in Blue Titanium Cerakote. 15″ M-LOK free-float handguard, 4150 phosphate barrel with 1:7 twist, carbine-length gas system. BCG and charging handle not included. SKU DT11-218.
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- FAQ Unassembled Upper Kit
This 16″ 5.56 NATO unassembled AR rifle upper build kit features a 15″ M-LOK free-float handguard — a near full-length setup that runs almost to the muzzle, providing maximum rail coverage and a clean, streamlined profile. Built on a carbine-length gas system and a 4150 CMV barrel with 1:7 twist, this is a solid foundation for a standard-length rifle build. Upper receiver and handguard are finished in Blue Titanium Cerakote.
Barrel
- Caliber: 5.56 NATO / .223 Wylde compatible
- Length: 16″
- Steel: 4150 Chrome Moly Vanadium
- Finish: Manganese phosphate
- Profile: M4 contour
- Gas system: Carbine-length
- Twist rate: 1:7 RH
- Muzzle thread: 1/2×28 TPI
- Gas block journal: .750″
Upper Receiver
- Material: Forged 7075-T6 aluminum
- Finish: Cerakote Blue Titanium
- Feed ramps: M4
- Made in the USA
Handguard
- Length: 15″ M-LOK free-float
- Material: 6061-T6 aluminum
- Finish: Cerakote Blue Titanium
- Compatible with M-LOK rail sections and accessories
Kit contents: Blue Titanium Cerakote 15″ M-LOK handguard with barrel nut and mounting screws, upper receiver, 16″ barrel, forward assist assembly, dust cover assembly, gas block with pin, gas tube, A2 flash hider with crush washer.
Note: BCG and charging handle are not included. Ships unassembled. SKU: DT11-218.
| Weight | 5 lbs |
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What’s the advantage of a 15″ handguard on a 16″ barrel?
A 15″ handguard on a 16″ barrel gives you a near full-length free-float rail with just enough clearance at the muzzle end for a device. You get the maximum usable handguard length — more mounting positions for accessories, a longer sight radius if running iron sights, and a cleaner, more uniform look than a shorter handguard that leaves several inches of barrel exposed. It’s a popular choice for builders who want a competition-style or precision-oriented rifle profile without going to a bull barrel setup.
Why use a carbine-length gas system on a 16″ barrel?
Carbine-length is a common and reliable gas system choice for 16″ barrels. It has a shorter dwell time than mid-length, which means the gas port is closer to the chamber — this results in a snappier, higher-pressure cycle. Mid-length gas systems are sometimes preferred on 16″ barrels for a softer impulse and slightly reduced wear, but carbine-length on a 16″ barrel is a proven configuration that runs reliably with standard 5.56 ammunition and is the standard setup on most AR-15 carbines.
Is 16″ the minimum legal barrel length for an AR rifle?
Yes. Under federal law, a rifle must have a barrel of at least 16″ to be classified as a rifle and not require NFA registration. A 16″ barrel is the shortest you can run on a standard AR-15 lower with a stock without going through the SBR tax stamp process. This upper meets that minimum — paired with a rifle lower and stock, it builds a legal, non-NFA rifle in most jurisdictions. Always verify state and local regulations as some states have additional restrictions.
What lower and stock should I use with this kit?
Any mil-spec AR-15 lower receiver will accept this upper. For a standard rifle build, pair it with a carbine buffer tube, carbine buffer and spring, and a collapsible or fixed stock of your choice. The upper receiver is machined to mil-spec dimensions — there are no proprietary fitment issues to worry about. BCG and charging handle need to be sourced separately.
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