Rifle Build Kit - 5.56 | RTB Complete 16" Upper Receiver with A2 | M4 6-Position Stock and Buffer Tube Kit | Bare Necessities Lower Parts Kit w/ Enhanced Aluminum Trigger Guard
This product is manufactured based on parts on hand. It may feature a standard or oversized trigger guard, depending on what we have available at the time.
RTB Complete 16" 5.56 Carbine Upper Receiver | 15" M-LOK | BCG & CH:
This Complete 16 inch M-LOK upper receiver comes with our RTB 15 inch free float handguard and is built with only the best Mil-Spec components. The heart of this upper is comprised of a 4150 barrel and our black nitride bolt carrier group that is finished with an incredible polish, making the action smooth and easy to keep clean.
Barrel:
- LENGTH - 16"
- MATERIAL - 4150 CHROME MOLY VANADIUM
- 11-DEGREE TARGET CROWN - FURTHER IMPROVE ACCURACY
- PROFILE - M4
- FINISH - QPQ CORROSION RESISTANT
- GAS SYSTEM LENGTH - CARBINE
- GAS BLOCK JOURNAL - .750" GAS BLOCK JOURNAL
- TWIST RATE - 1/7 TWIST
- MUZZLE - 1/2X28 THREADED
- WEIGHT - 28OZ
Bolt Carrier Group:
- Enhanced 9310 Steel (Bolt)
- 8620 Tool Steel (Carrier)
- Bolt is shot Peened and MPI
- All BCG components are pre-polished before being processed and then post polished for an incredible shine
Upper Receiver:
- Machined from a Mil-Spec 7075 T6 forging Hard Coat Anodized per Mil-A-8625F, Type III
- M4 Feed ramps
- Made in the U.S.A.
Handguard:
- MATERIAL: HARD COAT ANODIZED ALUMINUM HANDGUARD, ALUMINUM BARREL NUT
- PRECISION BORE
- ACCEPTS M-LOK RAIL SECTIONS & ACCESSORIES
- 7075-T6 BARREL NUT
- RAIL LENGTH IS MEASURED ALONG THE TOP
- INNER DIAMETER: 1.36"
Charging Handle:
- Tried and True Standard Charging Handle
- Forged 7075 Aluminum construction
- Mil-Spec Type-III Hardcoat Anodized finish
- Caliber - .223 / 5.56 / 300 Blackout
- Made in the USA
Tactical Sport 6-Position M4 Stock Kit:
This polymer stock is made from impact-resistant, high-strength material.
- Mil-spec Diameter Extension Tube Made from Aircraft Aluminum with Rolled Threads
- Built for Heavy-duty Operations with Tightest Tolerance Control
- Stock Assembly Complete with Action Spring, Buffer Assembly, Tear-drop Ring, and Castle Nut
Bare Necessities AR15 Complete Lower Parts Kit:
With everything you need for a complete lower, including every spring, pin, the Bare Necessities LPK makes your rifle truly complete by including the all-important Safety, Mag Catch, Hammer and Trigger, Take Down, and A2 Standard Grip.
Components:
- Disconnector Spring
- Hammer Pin & Trigger Pin
- Selector
- Selector Spring
- Selector Detent
- Magazine Catch
- Magazine Catch Spring
- Aluminum Magazine Catch Button
- Bolt Catch
- Bolt Catch Detent
- Bolt Catch Spring
- Bolt Catch Roll Pin
- Take Down Pin Take Down Detent
- Take Down Detent Spring
- Front Pivot Pin
- Front Pivot Pin Detent
- Front Pivot Pin Detent Spring
- Aluminum Trigger Guard
- Trigger Guard Roll Pin
- Buffer Retainer Detent
- Buffer Retainer Spring
- A2 Pistol Grip
- Pistol Grip Screw
- Pistol Grip Lock Washer
- Trigger
- Trigger Spring
- Hammer
- Hammer Spring
- Disconnector
*May come with standard “tear-drop” endplate OR ambidextrous sling loop endplate based on component availability.
Please Note: Uppers may present light fouling from our quality control process and/or test firing