Specifications:

Handguard.
The free float M–LOKhandguard from Stern Defense offers excellent ergonomics while remaining lightweight and strong. This handguard is M–LOKcompatible to accept your favorite attachments. Features a secure clamp on mounting system that ensures that the handguard remains in place even under heavy abuse, sustained full auto fire, and shooting prone from a bi-pod. Machined from 6061 aircraft grade aluminum and hard-coat anodized for longevity and durability. These handguards also feature quick disconnect swivel holes. 

 Also Included,  Barrel Nut and Bolts.

Technical Information:

• 6061 aircraft grade aluminum.
• Hard-coat anodized.
• Sturdy construction.
• Light weight construction.
• Length 15 inches.
• Smallest inside diameter 1.435 inches.
• Made in U.S.A.

Barrel.
Stern .40S&W barrels are ideal for gun lovers who want to build their own custom dedicated .40S&W  AR15 upper group. Machined to tight tolerances with quality as a top priority, you can’t go wrong with the SD .40 cal barrel.

Note: All SD Barrels come with the locating pin installed.

Information:

• Barrel length is measured in overall length.
• Caliber: 40S&W.
• Length: 16.1 Inches.
• Made in the U.S.A.
• Threaded .578-28.
• 1:16 TWIST.
• 4150 Chrome-molly steel.
• Melonite coating.

Receiver.
Mil-Spec flat top upper receiver with Stern Defense laser engraved dust cover and forward assist. Machined from 7075-t6 aluminum and hard-coat anodized. Mil-spec dry film lube in the bore.

Technical Information:

• 7075-t6 aluminum
• Hard-coat anodized.
• Sturdy construction.
• Made in U.S.A.

Charging Handle.
Mil-spec charge handle for AR-15 rifles.  Laser engraved with Stern Defense logo.  Our latch is  Ergonomically designed and provides a positive grip and easy one hand manipulations while charging your weapon under stressful situations. Made from 6061 aircraft grade aluminum billet and hardcoat anodized.

Technical Information:

• Laser engraved.
• 6061 aircraft grade aluminum billet
• Hard coat anodized.
• Sturdy Construction.
• Made in U.S.A.

Bolt.
Made with 8620 AISI steel and boasting a Mag-Phosphate finish, the Stern bolt fits into Mil-Spec and Glock-pattern upper receivers.  It functions with Colt SMG, Glock magazines and it’s fully compatible with standard AR15/M16 charging handles. Comes fully assembled with all sub-components installed, including firing pin/spring/retaining pin, extractor, and extractor spring.   Also included in bolt assembly is a propriety center and roll pins.  Our 40SW bolts incorporate our new bolt design which caters to single stage triggers with short resets.  It also allows use with the JP silent capture spring but is not recommend for 40SW applications. This bolt is compatible with the Law Tactical folding stock and the Echo trigger.

Technical Information:

• Made in U.S.A.
• Constructed from 8620 AISI steel.
• Custom 4140 billet extractor providing superior ejection.
• Glock cut.
• Coating: Mag-Phosphate
• Weight: 15.5 OZ with weight 13.3 OZ without.
• .40SW
• Compatible with single stage short reset triggers.
• Compatible with the Law Folding Tactical Stock
• Compatible with the Echo trigger.
• Compatible with the JP Silent capture spring (Not recommended)

 CB45 Compensator Break.
Manufactured to the highest quality standards right here in the U.S.A. Full auto tested to ensure that the compensator ports keep muzzle rise to a minimum. The twin chamber ports guarantee that every last bit of usable gas is utilized to kill recoil. Machined from US Mil-spec AISI 4140 steel and black nitride coated to provide a lifetime of abuse. .

Technical Information:

• Full auto tested
• US Mil-spec AISI 4140 steel.
• Sturdy construction.
• Black nitride coating
• Made in U.S.A.
• .45 CAL
• THREADED .578-28

Notes:
All S.D. .40S&W barrels are threaded with .45 CAL threads (.578-28) to accept .45 CAL muzzle devices.
Comes with crush washer.

WHATS INCLUDED!

Stern Defense 15 inch M–LOK rail(Barrel nut, bolts etc.)
Stern Defense 16.1 inch 40SW barrel.
SD CB45 COMPENSATOR BREAK
Stern Defense assembled upper receiver with dust cover and forward assist.
Stern Defense SD BU40 Glock cut bolt.
SD CH1 enhanced charging handle. 

Will come assembled