G&P Aluminum M4A1 Free Float Taper AEG Outer Barrel Kit Seal -It is Lighter Weight and

-It is Lighter Weight and Smaller Size than the Ni-CD/Ni-MH Battery

also known as microarc oxidation (MAO)

it will increase the the power by another 50 FPS or more depending on the AEG or GBBR you use

I would suggest using 0

And instead of the QUAD rails

G&P Aluminum M4A1 Free Float Taper AEG Outer Barrel Kit Seal -It is Lighter Weight andG&P Aluminum M4A1 Free Float Taper AEG Outer Barrel Kit Aluminum Construction One Piece Barrel 14mm Clockwise Only can fit G&P Taper Metal Body Fit for G&P Free Float Front Set series With Fluted on Barrel Length: 375mm 14. 5" SKU GP OTB BRL050 Item Weight (gram) 275 Major Color Black Length 375mm Built Material Aluminum Manufacturer G&P