I have a Madbull Clone on mine and it fits great.
There are different methods to fix the hop-up such as shrink wrap or TDC. I personally put a square piece of cardboard on the rubber for the arm to push and it seems to be working so far.
Try reading the thread on arnies. There's 200 pages of information on there.
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KJW Mk18 MOD1 BLOCK 2 - Well VSR-10 - Les Baer Ultimate Recon
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