Quote:
Originally Posted by Rabbit
Make sure your hop up unit is sitting in place properly too - squeeze that top receiver at the ass end and push down and in at the same time.
This fitment issue is standard on Colt KA M4a1's - my neighbors are probably firm believers that I have tourettes with the amount of swearing I did when I was first discovering this.
The charging handle also has to get over a hump on the gearbox as well so watch out for that.
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thanks the hop up was all the way in, i did try wrestling with it using all my body weight but it wouldnt go down, i can see why your neighbors would think that lol its a pain, and i was able to negotiate the bump on the gearbox, it was pretty standard on most m4s