The packaging left a lot to be desired as it was simply thrown into a plastic bag without taking care to keep it straight. So it looked like an accordion when I took it out. I put a heavy book on it for a few days and everything came out fine. The manual doesn't say anything about heating. But once it was pretty much in place and not entirely smooth, I set the blow dryer on high/hot until it clicked into place. Even the piece I put on the dismantling lever stayed in place. It now has enough drag surface to keep the gun from moving in my hand on recoil, but it's not as rough as sandpaper, which you'll want to skin unless you clean the surface to the point where they are unusable.
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