It's one of those guns the bushmaster company bought and failed to market.
It's basically the rifle version of the bushmaster ARM pistol. As an airsoft gun its regarded as one of the "most skirmishable" along with the sterling. And just so we are clear, The gun below is a picture of the RS I pulled off of armslist. personally, I think it's gaudy as all hell.
Airsoft isn't about being the fastest guy on the field, a guy with 99and1 kill ratio, or a being the dude with 1000's of dollars worth of guns and equipment on the field. It's all about having fun shooting other dudes who want to shoot you.
So it's not exactly rare, but I havnt seen any others around and it has a pretty low serial # which indicates that it is in fact, pretty old. All I ever see are the A&K version, and evike lists them as discontinued, so I imagine they are hard to find. G&G GR300. Also, crappy pic is crappy.
I also posted this when I picked it up a few months ago, but considering it is kinda "rare" I will put it up here. AtoZ
Did you happen to get that in a Box of Awesomeness? It is rare too because if I'm right they only ever gave out 8 models of the gun.
I did get it in a box of awesomeness, and its up on eBay now. From what I can tell there are close to a dozen out there. The only 2 I found on eBay went. For 1200 and 1750. It is a sweet rifle but I certainty won't be running through a field with it.