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.

I am very happy about this Product and about this great Shop and i am very glad about the 6 MM Shop,very big assortiment,very high quality of the products and very great and kompetent Service!The 6 MM-Shop is absolute excellent!

[CYMA] Metal SPR MK12 MOD 0 Flip Up Front Sight [For Tokyo Marui M4 AEG Series]

The shipment proceeded so fast.
Product is good, there are no hurts.