The STANDARD MilSpec Gladiator 556M Upper Receiver comes standard with the Iron Pig Forged Gen II Upper, Billet M-lok handrail with an 16 inch, 1:8 twist barrel, and M16 BCG & MilSpec A2 Muzzle Device.
If you would like to customize your upper, click on COMPLETE GLADIATOR UPPER RECEIVER-CUSTOM.
BARREL
These barrels are properly air-gauge tested and individually checked for headspace. 0ur quality control system ensures they are dimensionally correct and bores fall well within their individual tolerance ensuring superior accuracy.
- Length: 16″
- Weight: 29.0 ounces
- Caliber: 5.56 NATO
- Gas System: Carbine Length
- Twist Rate: 1:8 RH
- Gas Block Journal: .750″
- Gas Port Size: .063″
- Muzzle Thread: 1/2-28
- Material: 4140 CMV
- Finish: Blacknitride+™ by H&M
- Barrel Extension: M4
- 11° Target Crown
FORGED UPPER RECEIVER
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Receivers are precision machined from high quality forgings and fit all standard Mil-Spec style AR15 lower receivers. They do not have dry film lube applied.
- 7075-T6 Aluminum Forging
- Hard Coat Anodized
- No T-Marks
- 100% American Made
BILLET HANDGUARD
IPA AR-15 Lightweight M-LOK Handguard w/ Full Rail
- Finish: Hard Anodized
- Material: 6061-T6 Aircraft Grade Aluminum
- Gun Rail: M-LOK
- Steel Barrel Nut and Mounting Screws
BOLT CARRIER GROUP
M16 BCG which is trusted by seasoned shooters and depended on by experienced builders. Our goal is to go above and beyond Mil-Spec expectations! Iron Pig Armament’s BCGs are made to perform for tens of thousands of rounds. This is to ensure long-term reliability and the utmost durability and improved lubricity for our BEST-IN-CLASS BCG that is 100% American Made!
Bolt (May or may not have HPI MPI SP on bolt)
- Machined from Carpenter Technology No. 158 alloy.
- Heat treated
- Shot peened per ASTM B851/SAE AMS2430S
- Individually High Pressure Tested (test fired)
- HP proof testing, 100% using a high pressure M197 or SAAMI commercial equivalent, without evidence of failure
- Individually Magnetic Particle Inspected after Initial Test Fire
- Manganese Phosphate Finish
Extractor
- 4140 Steel per ASTM A108, cold drawn and stress relieved BHN 187-22
- Phosphate Finish
- Extractor Spring
- Black Extractor Insert
- Viton O-Ring
Carrier
- Machined from AISI 8620 aircraft quality alloy per ASTM A108/A322-13
- Full Mass M16 Profile
- Stress Relieved
- Hard Chrome Bore
Gas Key
- Machined from 4130 chromoly steel alloy per ASTM A108/A322-13
- Grade 8 Hardware
- Properly Staked
- Hard Chrome Internal
- Permatex sealed
