As the GHK SIG 553 Gas Blowback Rifle does not come with markings, those who want to have markings on theirs can check the service from Papago Arms. They have an engraving service that will make your GHK 553 GBB more legit looking. Previously, they have a freely downloadable 5.56mm magazine sticker design for the GHK 553 gas magazine. Combine both and you can come up with a more realistic looking GHK 553 airsoft GBB rifle.