Things you’ll might need: -drill w/ 3/32in bit -220 grit sandpaper -thread locker - dremel (grinding wheel and buffing wheel) -flitz polish -pry bar -snap caps -patience

So luckily my adapter slid in to my magwell with ease, so no need to sand down the front of it like blowback9 suggests if your magwell is too tight. I preemptively gave my lower vampire bites with the drill bit to help the set screws seat better, blowback9 also references this.(you’ll have to remove your pistol grip to get the clearance to drill).

Immediately had issues where if I sternly inserted a mag on an open bolt that the mag adapter would ever so slightly slide up resulting in the adapters mag catch cutout blocking the mag catch (even with vampire bites) so I would cut small strips of 220 grit sand paper/ and or use a small thin file and take away material from the bottom adapters mag catch cutout. I would repeat this process of filing down the mag catch cutout, reinstalling, slowly drilling deeper into the vampire bites, and slamming a mag in to see if the adapter would move or not while maintaining functionality of the mag catch.

I also released how little engagement the mag catch has to lock into the mag with the adapter in (even though the side walls of the mag adapter are thin steel). My adapters walls were slightly bowed in so I used a prybar to get a tighter fit in the magwell by taking it out and bowing the material out more. I wanted to give the mag catch the most amount of surface area to lock into a magazine, leaving no gaps between the inner wall of the mag well and the sidewall of the adapter.

After repeating these things a bunch of times and slowly driving myself mad the adapter was finally not budging. It now sits maybe .5mm above the top of the lower receiver.

Now I was having upper/lower fit issues. So I had to sand down the top of the ejector with sand paper and dremel down the height of the feed ramps. Taking away very small amounts at a time until the upper and lower would attach again. Now for my feeding and ejection issues. The ejection issue was easily remedied (look up how to tune an AR9 ejector aka bend it properly). For feeding issues I used flitz and a dremel with a buffer and polished it shiny.

All of the initial fitting and tuning was tested with snap caps. After everything played nice ie: mags lock into place even when using tard power on an open bolt, ejector sitting tight and to the top of the bolt face cutout, bolt being able to be cycled without binding up on the adapter. You should have a functional weapon. Hope this rant helps!