Receiver Specs

• The Mil-Spec M4 flat top upper receivers are made and designed to be used with our piston system. The op-rod hole is the proper diameter so a bushing is not required at all.
• M4 feed ramps
• Spider logo
• T-Markings
• Mil-Spec Type III hard coat anodizing
• Mil-Spec dry film lube on the inside of the receiver

Barrel Specs

• 16" Match Quality stainless steel barrel
• Government profile under the hand guards
• Mid-Length gas system
• 1/8 twist rate
• M4 barrel extension
• Chambered in 5.56 Nato
• Threaded 1/2x28
• Melonite coated inside and out for excellent corrosion resistance and durability

Piston Block Specs

• High quality stainless steel
• Low profile design
• Pinned to the barrel using (2) 1/8 hardened straight pins
• Has 3 gas settings: full gas, suppressed, and no gas (single shot)
• Melonite coated inside and out.

Piston Plug and Op Rod Specs

• High quality stainless steel
• Melonite coated inside and out
• The system can be broken down from the front, requiring no tools

Bolt/Carrier Specs

• 1 piece design
• Have skies as well as a champher on the rear of it to help prevent carrier tilt and drag
• Melonite coated inside and out
• Engraved with our Spider logo
• The Mil-Spec bolts are spring loaded
• Shot peened
• MP tested
• Each extractor will be fitted with a Viton o-ring and Black extractor insert

Other Specs

• 9" Daniel Defense Lite rail
• Spike's Tactical Billet charging handle
• Each upper comes with an ST-T2 buffer
• A2 Flash hider.

**Troy sites NOT included**

Because this product comes from Spike's Tactical, please allow up to 2-3 weeks for delivery.