On the 2009 Martin Bengal w/M2 Pro cam, the F5 is listed at 29"......F6 is the off module, stuck somewhere between listed 29" F5 and 30" F7.
I had quite bit of frustration getting correct draw length on my '09 Bengal at first. (& think posted my confusion/frustration on here about a year ago)
When I test shot the bow, they said they put on a "F5" module on it for my 29" draw. FYI: Being a lefty you can't read module number w/o taking it off, so trusted what I was told.
The set-up felt little too long, but assumed it was due to d-loop and long head release I was using and I bought the bow as it was.
Later dropped draw a half inch by moved string from pin 1 to pin 2 and it was still too long.
Dug into the pack of modules and found I had a F4 and a F6, so assuming I did have the F5 on it, I put on the F4 back at pin 1....in theory, another half inch shorter.
This time it was too short and my arrow speed took too big of a big drop for just a half inch......I'm getting pissed at this point.
Went back and grabbed the original module, noticed it was aluminum and not same material or part of factory module package. Stamped in "F" number was hard to read, so I laid it on top of the F6 in my pack and found a perfect match....turns out I had gone from near 30", to near 29.5", then all the way down to 28". Arrow speed loss made sense now.
Went back to dealer, had them get me the missing F5 module, install it using Pin 1 and it finally fit close enough that I only moved the draw stop up one notch to get it right where I want it.
Thinking the dud F6 module (on Bengal) is somewhere closer to the F7, maybe around 29.5" to 29.75"???
2009 Martin Bengal M2 Pro Cam w/factory STS & CCS.....66lbs, 29" DL, 422gr @ 272fps, Winners Choice string/cable, Trophy Taker drop-away Rest, Scott Release
1996 Martin Firecat XRG Pro Series w/Ultra Sonic wheels.....69lbs, 29" DL, 465gr @ 245fps, w/fingers & Martin leather glove