BCM 16" 300 BLK 1:7 Tapered Contour Barreled Upper - 15" KeyMod KMR Alpha Rail - BCM-URG-300BLK-16-KMR-A15

Expect nothing less than professional grade weaponry from BCM. This Bravo Company Manufacturing Barreled Upper Receiver is built around a 41V50 chrome moly vanadium steel barrel. This MIL-SPEC steel is stronger and will outlast most materials found in the commercial market.

The BCM KMR ALPHA Handguards are constructed from 100% aluminum. Hardcoat anodized for an anti-reflective, corrosion resistant finish. KeyMod mounting slots on seven sides, plus a continuous Picatinny rail provide an enormous amount of space for all your favorite accessories.

Features:

• 16” 41V50 chrome moly vanadium steel tapered barrel with Manganese phosphate finish
• Chambered in 300 BLK with 1:7 twist rate
• 5/8×24 BCM Comp Mod 1 
• Chrome lined chamber and bore
• High pressure tested and magnetic particle inspected
• M4 feed ramps
• T-Marked Picatinny rail
• 15” BCM KMR ALPHA KeyMod Free Float Handguard
• (1) 3” Picatinny rail section
• (1) BCM KeyMod sling mount

Notice from the manufacturer:

“BCM has taken great care to ensure the best possible performance and interchangeability. However, due to the large operational range of 300 Blackout ammunition in the market place, BCM cannot guarantee function will all ammunition types in all conditions. These barrels were designed to run with a carbine buffer with subsonic ammo and a H3 buffer with high velocity ammo. Fine tuning may be required in limited instances based on ammo and buffer choices that work best for the desired application. BCM also recommends running the Crane O-ring (provided with all BCM Bolt Carrier Groups) over the extractor with 300 Blackout.”