Matrix 1200 Round Electric Drum Magazine for Airsoft Shotgun
(Model: Sound / Black)

"Drum mag feeds fine, I used this on TM spas 12. I needed to remove the feeding door off the gun. The left and rightside edges had to be dremmeled down similar to the TAPP 870 where the surface is flat. The wing at the front of the drum mag had to be removed for it to allow the pump to fully rack back.

"Got the 870 Drums for my Jag Arms Super CQB,
Should fit most Jag Arms since the 870 main body is the same on most of them.
They feed well enough. The switch seems fragile so I would be gentle with it.
Had to remove the trap door on the shotgun so it wouldn't get in the way.

Remember to remove the tabs on the side of the magazine adapter part.
Otherwise they will collide with your mag well and won't fit in all the way, it took me a while to figure that out.

"Tested this with 2 shotties. (Electric version, not sound activated)
Worked perfect with a CYMA M3. I can access front feeding-button without removing the mag door.
Didn't work with an EliteForce Semi-Autro Trishot. Only fed 1 BB, mag doesn't lock in place. (Shotgun's design had a smaller shell area)

Pros:
-Lightweight
-Huge capacity
-Fits perfectly in more-normal shotties
-Just functions great all together

Cons:
-Screw for access battery is very tiny, bit annoying
-A bit expensive, normal M4 mag adapters would probably be better if they ever get restocked