20pcs per pack in 4 thickness Stainless Steel Shims
A Must needed item for Barrel Nut / Rail system Alignment on ALL AEG, PTW, EBB.(Size: 25 x 30 x 0.5mm x 5pcs) Red(Size: 25 x 30 x 0.3mm x 5pcs) Blue(Size: 25 x 30 x 0.2mm x 5pcs) Black(Size: 25 x 30 x 0.1mm x 5pcs)