Dan Coonan has a long history in the firearms manufacturing industry, previously making FAL receivers on the Dan Coonan Industries (DCI) name, for Federal Arms Corp (FAC) and AK receivers for Nodak Spud. See my review of the FAC receiver, also on this website.
While the FAL receiver was always on the back burner, the incredible sales volume of AK receivers made it impractical to deal with at the time. When demand for AK receivers slowed a bit in 2009, Dan Coonan and Dave Neville were able to give the FAL receiver the attention it needed. As you will see from this review, they did a fine job.
Locking shoulder larger than .263″ are far less common than those smaller, and are unlikely to be found in a parts kit. If DCI could make this receiver take a .258″-.262″ locking shoulder, with any variance in the direction of a smaller locking shoulder, it would save customers from having to buy a less common locking shoulder. I tried two other barrels to verify this was the receiver and not an unusually deep chamber.
I also noticed that the locking shoulder appeared to go in just a little shallow. A shallow locking shoulder dog-leg recess was common on the FAC receiver as well. It is not necessarily a problem, but perhaps something for DCI to check against their prints.
I look forward to building on these.