Installed, it's cleverly designed. As you tighten down the lower handguard it digs in to polymer "ribs"'and more or less custom fits it to your rifle. Fit is rock solid. Makes the fore end of the rifle a good deal chunkier. Some may like that while some may not. This is on an IO Ak. Supposedly takes standard AK furniture which this would seem to bear out. Stock is on back order.