Up for sale is an excellent condition Polarstar Jack KWA KM4 CQB. Gun shoots great and looks awesome. Parts List - - Polarstar Jack professionally installed by Strike Force Sports - $360 - KWA KM4 CQB - $210 - PTS ZEV Wedge lock handguard 9.5” -$100 - PTS Fortis shift grip - $35 - Noveske Amplifier -$40 Total new was $745ish asking $560 T-1 can be included for $50