So installation wasn’t so hard. Take it slow and use plenty of cutting fluid. I even did it by hand but a drill press would be most optimum. Problem comes from this is not a universal kit. I drilled a juggernaut billet lower only to find out my upper doesn’t make contact where the pin is which then doesn’t lock the mag. I understand they include a mag release but I only found it better to drill through my current mag release as it guarantees the holes line up and acts as a back stop once you go through the lower. The pins are pretty dang expensive at 25 a pop. Hogue gives you three pins for $45. If you don’t have an ambi bolt catch release button I recommend the hogue. Just make sure your upper make contact where this pin will be before purchase.

It's a very clean and easy install if you have a metrology room and a machine shop. I have it paired with Juggernaut Tach. hellfighter takedown pin. I get my bolt release button back, and the bolt locks back on an empty mag. This is a great product.

Purchased the Hellfighter from Juggernaut Tactical and made me get rid of my Geissele bolt release for their mag lock so this product allowed me to have my bolt catch back!! works like a charm

I have multiple magazine lock options but JL Billet has a better finish than all the rest. The fit is much more secure than the others too. The turnaround time was just 4 days! I will be purchasing more JL Billet products in the future.