Quote Originally Posted by GM View Post
Hmm, IIRC the only difference between the two expansions is that the 594 is a truncated 994 to create a larger throat same as the 511E Vs 511B, so from the front you're not likely to notice which it is.

GM
Yep. The MRII594/MR994 share HxW dimensions, and only 7/10" difference in length.

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(courtesy Lansing Heritage)