I had one back in the late '80's. In all honesty, I was pretty disappointed with it. As I recall, it used a piece of hose for a recoil buffer. The rear grip was also uncomfortable as heck too.
The positives of the gun where : it was pretty accurate for what it was, and it looked cool as heck. I sold mine in the early '90's for a loss and do not regret it.
hth
ka