AC Unity is absolutely killin it by listening to the market and what people want. Its been quite a while since wide G3 forearms have been available. Now, thanks to AC unity they are back. The bipod cuts in the forearm are deeper so the bipod legs hug tight to the forearm. The locking tab and QD cups seem to be made of steel. The front bipod housing seems to be made of AC unity’s special metal they use in their mags, or its aluminum. Its a low impact part, so it truly does not matter. Bipod fit my PTRGIR101 rifle perfectly, zero mods needed to mount. If you’re like me and have been checking RTG religiously for wide forearms.. go ahead and get this, you will not be disappointed. And get the bipod here at RTG as well, while they last!