Ya, inner tube is what to use. I think the size I bought is 14 x 1 7/8". Except you don't use a little bit, you cover as much of the grip as possible and leave enough extra at the bottom to fold over the front of your mag. When you want the mag out or plan to change mags often (like in CQB), you just fold it out of the way. Feels great on the gun, works like a charm. Works best on Glocks, but only GBB I tried it on besides those is a Hi Capa, and that was a challenge. Just make sure to turn it inside out before putting it on, that way you get the smooth powdered side on the outside, helps the tube stick to the grip. I also have inner tube on both of my MP5 grips.
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