Rifle Build Kit – 5.56 | 16″ Complete Upper Receiver | M4 6-Positon Stock Kit | XTS LPK

Pistol Build Kit – 5.56

16″ Complete Upper Receiver with A2 | M4 6-Position Stock and Buffer Tube Kit | XTS Lower Parts Kit with Polymer Trigger Guard

Complete 16″ 5.56 Carbine Upper Receiver | 15″ M-LOK | BCG & Charging Handle

This complete 16-inch M-LOK upper receiver features a 15-inch free-float handguard made from top-tier Mil-Spec components. At its core is a 4150 M4 barrel paired with a black nitride bolt carrier group, which is exceptionally polished for smooth operation and ease of maintenance.

Barrel:

• 16″ 5.56 4150 CMV Barrel – Black Nitride
• M4 Carbine Profile (0.750″ Gas Block Journal)
• 1:7 Twist Rate with 1/2×28 Muzzle Thread
• Equipped with A2 Flash Hider

Bolt Carrier Group:

• Enhanced 9310 Steel (Bolt)
• 8620 Tool Steel (Carrier)
• Bolt is shot peened and Magnetic Particle Inspected (MPI)
• All components are pre-polished before and finished with a high polish afterward for a brilliant shine

Upper Receiver:

• Machined from Mil-Spec 7075 T6 forging
• Hard Coat Anodized following Mil-A-8625F, Type III standards
• M4 Feed ramps included

Handguard:

• 15″ Lightweight Free Float M-LOK

Charging Handle:

• Constructed from forged 7075 aluminum
• Finished with Mil-Spec Type-III Hardcoat Anodizing

Tactical Sport 6-Position M4 Stock Kit:

This polymer stock is designed with impact-resistant, high-strength material.

• Mil-Spec diameter extension tube made from aircraft aluminum with rolled threads
• Built for heavy-duty use with stringent tolerance control
• Stock assembly includes action spring, buffer assembly, tear-drop ring, and castle nut

XTS AR15 Complete Lower Parts Kit:

Featuring everything required to complete a lower, the XTS Lower Parts Kit includes all essential components such as the safety, magazine catch, hammer, trigger, take-down pin, and A2 standard grip.

• Safety 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 with Detents and Springs
• Front Pivot Pin with Detents and Springs
• Polymer Trigger Guard
• Trigger Guard Roll Pin
• Buffer Retainer Detent and Spring
• A2 Pistol Grip with associated screws and washers
• Trigger and Hammer with springs
• Disconnector with spring
• Hammer and Trigger Pins

Note: The kit may include either a standard “tear-drop” endplate or an ambidextrous sling loop endplate depending on component availability.