GraCoil and ISIS are made similarly, but the GraCoil is made of aluminum, while the ISIS is made of plastic (polymer). If they will hold up, the weight savings may be a good idea. ISIS claims there is NO change of balance when adding one to a gun.

I can attest to the durability of a GraCoil, having used the same one on my Perazzi comp gun for about eight years with no problems. I am not sensitive to recoil, but it was on the stock when I got it, and I just left it there.

SRH

May God bless America and those who defend her.