Originally Posted by
UNM1136
For institutional users, aside from cost / retraining / small parts availability (of which really nothing competes with the AR) I suspect the primary issue would be having a fixed stock rather than length of pull.
Whereas an AR can compensate hugely for different body types by changing the length of the stock, a bullpup can only be tailored by moving the optic forward or back to suit a specific shooters eye relief. Not much of an issue with a RDS, but big issue with a magnified optic.