We have just tested these and wow!
They are really super strong and durable
NYLON , DURABLE, STRONG, QUITE, LESS FRICTION
YOU ARE BUYING BEAST UPGRADE:
# 1 x SUPER STRONG NYLON M4A1 GEN 8/9/10 Pump Bridge/Tappet Plate (ORANGE)
BEASTPRO IS FULLY AUSTRALIAN OWNED AND OPERATED - ALL PARTS IN STOCK. FREE SHIPPING FOR ORDERS OVER $100