The hi capa hop unit does not have the post to hold the guide rod. The meu hop unit has the post to hold the guide rod.
You will have a problem fitting the meu hop unit into a hi capa if you have a full length guide rod.
You can remove the post and use your hi capa guide rod. You can put a hole in the guide rod to fit over the post (might still have install issues because full length guide rods for meu are two parted and screw together in the middle) or you can use an meu guide rod that is shorter.
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