5ku Ak folding stock £20
Ak 74 Railed Gas Tube £10
Specna arms M4 metal body £15
PTS Centurion Arms M-LOK CMR 9.5" £80
7 inch Madbull Pri gen 3 delta rail £75 (Few light marks on base)
XM 177 handuard set £15
M4 A1 Handguard. Lightly sprayed with top rail £10
Compression test the cylinder. With the cylinder out of GB with tappet and nozzle fitted. Hold finger over nozzle and push piston down into cylinder. It should stop 2/3 way down when all air is compressed. If it doesn't replace the piston oring.