Nope, never heard of Parker Bullets. I also never got a gun that I had to give back, kinda like getting a new puppy and once you bond you have to give it back. But I guess you'll have fun experimenting and if for some reason you dont like the ML you did'nt buy it so you just send it back. Anyway Im sure you'll have fun and that's all that matters, Take Care and Havea Blast! Ron