I was on my way out to hunt on the weekend when it showed up. It took me about 15 minutes to install it at my friends kitchen table using only the HK multi tool.
The kit includes the new magwell, bolt catch and bolt catch pin. Magwell is ambidextrous, made of polymer. The new bolt catch is all metal and is ambidextrous also. The fit and finish of the magwell is excellent. I put a 100 round though it and it worked perfectly. The new extended bolt catch functions exactly like it should.
Remove factory buttstock and magwell (don't need factory magwell)
Remove factory mag release, pin and spring. ( don't need these)
Remove bolt catch pin, hammer pin, hammer springs, hammer and bolt catch. (don't need factory bolt catch and pin)
Install new extended bolt catch, factory hammer springs, hammer and new bolt catch pin.
Install buttstock and new magwell. The magwell push pin went in, but it was a little snug.
So here it is: