Lightweight, low-profile clamping system attaches the backup magazine directly to the one in the gun for ultra-fast reloads. Holds two 20- or 30-round Magpul PMAGs side-by-side, with a tension-adjustable coupling that prevents the spare magazine from shifting. Precision-machined from billet aluminum with minimal bulk and smooth, radiused edges that won't abrade the hand. Rugged and reliable enough for tactical and competition use.