Huge improvement over the standard bolt catch. It leans forward at a steeper angle and it is obviously much larger. I haven't been able to manually lock the bolt back with the standard bolt catch since I put the HVA ambi magazine release on but the ABC-R lets me do it. It took me about 2 minutes to install it with a 1/16" punch, a hammer and masking tape to protect the receiver. It could have been even faster if I had been home with my AR vise block.