Like Grey says, depends on how they fell that day. I just received and order from HK the other day with a bunch of MP5 and AUG mags, springs, gears, pistons, MP5 cocking handle and muzzle brake and they all came through ok, but a V3 gearbox shell was seized as "it is classified as a replica firearm receiver". I'm currently in "negotiations" for it's release.
ASC & RAAT Age Verifier for Central Alberta
Authorized G&G Dealer.