12.5" BCM FSB

This 12.5" AR Pistol build was inspired by the old school look of the iconic MK18 Mod 0 with Front Sight Bases (FSBs) of the early GWOT era. To start things off, a complete BCM Lower receiver was sourced and built using all BCM parts minus the HRF RCM flared magwell and SB Tactical SBA4. The upper receiver was built using more parts from BCM including a shortened Quad Rail that sits flush up against the front sight base for that classic look. We went with a Rosco Manufacturing 12.5" barrel paired with an OSA BCG. For an optic, we stuck with the OG look and opted for the Aimpoint PRO with a Magpul Pro metal rear sight. To finish this build, an ESD sling was added as well as a Surefire Scout M600 with a Dual Lead Switch for when one of our laser aiming devices are added.

Components Breakdown

Upper Receiver Group

• BCMReceiver in Standard Type III Class II Anodize
• BCM QRF-8 Quad Rail Free Float Handguard in Standard Type III Class II Anodize
• Rosco Manufacturing Bloodline 12.5" M4 5.56 NATO Barrel w/ OSA BCG
• OSA Non-Adjustable Gas Block
• OSA Carbine Length Gas Tube
• BCM Charging Handle
• FCD 3 Prong Flash Hider
• ESD Sling in MultiCam
• BCM Sling Swivels
• Surefire Scout M600 in FDE mounted via Surefire SR09-D-IT Switch & Arisaka Mount
• Aimpoint PRO
• Magpul Pro Rear Sight
• TangoDown Stubby Vertical Forend Grip

Lower Receiver Group

• BCM  Lower Receiver in Standard Type III Class II Anodize
• BCM PNT Trigger
• BCM 6 Position Buffer Tube
• BCM Recoil Spring
• BCM H2 Buffer
• BCM QD End Plate
• SB Tactical SBA4 Brace
• BCM Grip Mod 3
• HRF RCM Magwell