Ya I have the mark version that has sat in it's case since 2016 after buying it in 2015, don't shoot it much and I consider it one of my dumbest firearm purchases. But a buddy has a usg that he's used for carry for over 10 years and his just popped out and he can't find it. He has tons of ammo and misc parts but no mag catch spring, pretty much figured it was a no go being they are all sold out. All kinds of 57 parts online but no damn catch spring. We are having a local gsmith make the old version spring or attempt to. If not he's selling his as is and I will sell him my 57 being I have no plans to shoot it again. But it would be nice just to be able to click it into a cart and order it.