"Have owned this for awhile now and gamed with it as the M4 mag portion of a P90 box mag. It has excellent feel and look and fits firmly in the mag well. While I don't use it myself, I think the alternate base for mag pull is a great value. The only issue I take with this unit is that it winds a little light and the plastic gears are a bit noisey while winding. Over-all a decent buy!!"