I have had the Rare Breed Gen 2 and the Alamo-15. Both worked great when you take the time to train with them. Adding a dedicated semi will just make it more fun and easy to use. Both seemed to run a little faster than regular full auto but did need time on the trigger to get used to them.
I...
This is the fella that does an adaptor which uses the 1913 Pic Rail.
Looks great and locks up real tight. Installs in a few minutes and comes with a nice set of instructions.
Improved the accuracy and very comfortable on my MK Arms 760.
brmiles@sbcglobal.net
Wolff Gunsprings has them in stock under their rifles/shotguns section.
https://www.gunsprings.com/SMITH+&+WESSON/76+SMG/cID2/mID58/dID448
Hope the link works!