I owned one of the steel receiver 60' and a newer plastic 61. The steel receivers are by far superior, but the plastic ones are fine. Still extremely accurate, and with an excellent trigger, they're great little plinkers and good trainers. Just resist the urge to get "just a little more power", it ain't gonna happen :-). A lube tune is worth while, and there are a couple of very minor tweaks that can be done. There's an article written by Russ Best still floating around, I have a copy on my computer, so if you'd like it, let me know and I'll email it to you. Other than feel, the only down side to the plastic receiver was the scope rails, not only are they short, but on my 61, they were a little twisted front to back, which made scoping it a bit of a challenge. I got a Bug Buster for mine with a set of BKL offset mounts. It was a great fit, but the optics on the BB sucked. From the reviews I've been seeing, they must have improved. Either that, or everyone that has reviewed them is blind ;-). I liked having a diopter sight on it better, and turned the front hood into an aperture with some fine wire. That was a lot of fun shooting at 10M. Later.
Dave