ive heard they work well, yours sounds great i will look for one.
I've had it almost 15 years, can't remember where I got it ~ I think is was an add in one of the gun magazines or American Rifleman.
I bought this Ruger when they first came out ~ was it in the late 60's or early 70's? I have one year old Mini 14 SS Ranch model with a composite stock, nice gun.