M4 to Striker adaptor

thingiverse

If you're not satisfied with the standard 45-shot capacity of your striker, this device is perfect for you. Simply insert an M4 magazine into it and enjoy. I've personally tested the Bluebox M4 magazines and they function flawlessly. However, other mags may have a slightly smaller notch on their base plate, requiring a slight adjustment to the mag retention arm to ensure secure seating.