Quantity in Stock: 7.5" Medium Profile Barrel 5.56 .223 + Polished Premium Complete Nitride Bolt Carrier Group
Barrel Info:
This 5.56 chambered 7.5 inch Pistol Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and QPQ coated M4 feed ramp extension.
Quench Polish Quench (QPQ) is a specialized type of nitrocarburizing case hardening that increases corrosion resistance. It is sometimes known by the brand name of Tufftride, Tenifer Black Nitride or Melonite. QPQ is a huge improvement over Chrome Lined barrels. Unlike chrome lining, where the chrome is built up on the surface, QPQ converts the surface without the risk of dimensional build up.
| Barrel | Specifications |
|---|---|
| Caliber | 5.56 |
| Length | 7.5 |
| Material | 4150 Chrome Moly Vanadium |
| Profile | Medium |
| Finish | QPQ Corrosion Resistant |
| Gas System Length | Pistol |
| Gas Block Journal | .750" |
| Dimpled? | No |
| Twist Rate | 1:7 |
| Muzzle Thread | 1/2x28 TPI |
| Weight | 16.8oz |
| Barrel Extension | M4 Feed Ramps |
| Target Crown | 11 Degree |
The best BCGs for replacement parts and builds have strong and dependable carriers with trusty bolt assemblies that cycle reliably. That's exactly what you'll get with this high quality complete BCG. This M16 bolt carrier group is polished before and after the H&M BLACKNITRIDE+™ process, producing a beautiful finish and reducing the friction coefficent. The carrier is made from 8620 steel. The bolt is made from 9310 steel. The 223 Bolt and Bolt Carrier Assembly is compatible with 5.56 NATO and 300 Blackout.
- Enhanced 9310 Steel (Bolt)
- 8620 Tool Steel (Carrier)
- Mil-Spec Extractor Spring, black extractor insert, Viton O-Ring
- Tool Steel Extractor
- Shrouded Firing Pin
- Mil-Spec Gas Key (4130 Steel) attached with Grade 8 hardware and heavily staked
- Caliber: .223 / 5.56 / 300 Blackout
- Bolt is shot Peened and MPI
- All BCG components pre-polished before being processed and then post polished!
