The MD-BTR from Mako Defense is a 3 Sided Picatinny mounting Rail System for AR15/M16/M4 weapons platforms.

# Features include: All rails are parallel to barrel.
# Designed to fit in the barrel cut (groove) of M4 type rifles.
# Lightweight, Very Secure, No Movement
# Rotate to any position to align lights or lasers w/sight
# Skeletonized for heat dissipation.
# CNC Machined, 6061 Aircraft Grade Aluminum
# Type 2 Class III Hard coat Anodized.
# Easy to install
# Lifetime Warranty