the original jig was made off a set of DJM lowers. the new one is totally off a set of stock lowers.
so the fit is much better. the uppers are now adjustable also. adjusted all the way in, they are the same length as stock and can be adjusted out about an inch.
this will allow them to be used on trucks with stock frames as well as ones that have been Zd or have had the upper mounts raised.
www.builtbybyc.com