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.
![[Z-Parts] Alloy Stock Tube[For VFC M4 / HK416 GBB Series]](http://www.sixmm.com/cdn/shop/products/Z-Parts_AlloyStockTube_ForVFCM4HK416GBBSeries_2.jpg?v=1659683955&width=950)
![[Z-Parts] Alloy Stock Tube[For VFC M4 / HK416 GBB Series]](http://www.sixmm.com/cdn/shop/products/Z-Parts_AlloyStockTube_ForVFCM4HK416GBBSeries_1.jpg?v=1659683955&width=950)
![[Z-Parts] Aluminum OTB Buffer Tube for SYSTEMA PTW (Blk)](http://www.sixmm.com/cdn/shop/products/systema-416-002-_1.jpg?v=1611642360&width=950)
![[Z-Parts] Aluminum OTB Buffer Tube for SYSTEMA PTW (Blk)](http://www.sixmm.com/cdn/shop/products/systema-416-002-_2.jpg?v=1611642360&width=950)
![[Z-Parts] CNC Aluminum Mil-Spec 6-Position Buffer Tube For M4 GBB](http://www.sixmm.com/cdn/shop/products/2_989552e4-63cc-46c3-b9f5-d0d00b5474f9.jpg?v=1611642573&width=950)
![[Z-Parts] CNC Aluminum Mil-Spec 6-Position Buffer Tube For M4 GBB](http://www.sixmm.com/cdn/shop/products/3_b1b001a1-b400-4d93-80b6-19fda640a874.jpg?v=1611642573&width=950)