Jsb mk1 vs mk2. What\'s the difference?

I always thought the MKII was altered to work in a magazine? the MKI can be too long for some mags.

Yeah, that's right. he MkI's are a little harder to get in the magazine but work. It's very minimal when the two are next to each other. I chambfered all of my regular magazines and have the new 28 round magazine that the back comes off of for easy loading, so I kind of forgot. If you hold them side by side, the difference is noticeable but very minimal. If you look inside the skirts, the MKII isn't as deep and looks a little different. POI difference is minimal, but they definitely group differently. I would have taken a picture but I just tuned my gun for the MKII's and ran out day before yesterday. I'll see if I can dig one up somewhere.

Stoti
 
Yep, true about the skirts and some mags. That was a big topic in the forums a few years back.

I found out by trial and error that my Gen 1 .Impact really likes the MKII while my Kalibrgun Cricket seems to prefer the MKI ,but not by much ,so the Cricket get's the MKII just like the Impact. I don't want to have to buy double of everything.

I don't compete....just punch paper and do some light pesting now and again, so the Cricket is happy enough with the MKII.