AR15 &M4 HPA Speed QB grip

I have modified it slightly and sealed the battery door to improve strength, and widened the holes to fit my Amped 12mm line through. I needed to replace the M3 grip screws, as it’s base is too big and interferes with the line hole. I just got regular M3 screws with a regular-sized head, and it works perfectly.

Installation was very difficult for me because I had to go through the bottom, and I needed a flexible shaft to reach the recessed screw holes. If I have another chance, I wouldn't seal the battery door.

Overall, it's a really comfortable grip. It looks and feels very good. It can be a little bit thin at the top without the back strap, but it's still very usable.