The tracking information said "US, Delivery incomplete (recipient not available - recipient notified)". HK Post no longer had the package. USPS never generated a tracking number and I could not initiate and an inquiry with the HK Post tracking number. I asked SIXmm customer service for help, but they just pointed me at USPS. I gave up and never asked for a refund, but SIXmm was nice enough to send an auto-generated email asking for a review.
![[SHS] Airsoft Cylinder head [For M14 AEG][Green][V.7]](http://www.sixmm.com/cdn/shop/products/SHS_AirsoftCylinderhead_ForM14AEG_Green_V_1.jpg?v=1644594069&width=950)
![[SHS] Airsoft Cylinder head [For M14 AEG][Green][V.7]](http://www.sixmm.com/cdn/shop/products/SHS_AirsoftCylinderhead_ForM14AEG_Green_V_2.jpg?v=1644594069&width=950)