We have done all the hard work and spent a lot of money in research for you and these parts that I am now selling are the best and will be the right type of upgrade that will give you the best benefits.
YOU ARE BUYING BEAST UPGRADE:
# 1 X M4A1 GEN8 8 hole aircraft grade alloy plunger head with bearing
Use with aftermarket PISTON
Aircraft grade alloy
If all blue are out we will send another colour.