Did someone mention Entreprise?
DSA receivers will have smoother edges. There is no difference in terms of finish (both are parkerized), and if the ejector block seems out of place on your receiver we will replace it under the lifetime warranty that accompanies each we sell. We will also support you in your build if you email us (or me, for that matter).
The locking shoulder is set for .265, the barrel is set to hand time at 10:30, and if you mention my name when you order we'll get you free shipping at a cost of $329 for a Type 3.
While we are primarily a manufacturer, we also build rifles from any customer supplied receiver. Sometimes we get requests for DSA receiver builds. DSA receivers seem to be spec'ed for DSA barrels - this can result in complications for builders using surplus parts such as IMBEL or STG. As well, CAI receivers often need larger locking shoulders in the .270 range. Finally, IMBEL receivers time very well with IMBEL kits (surprise), but complications arise when building upon STG Austrian kits.
Entreprise, DSA, IMBEL receivers all make fine rifles, but the point is that building a FAL is not necessarily one-size-fits-all.
Finally, considering purchasing IO Inc's great bargain right now with the Lithgow Australian L1A1 kits. Complete kit with one magazine and a brand new green mt barrel (this will reduce your 922 count further) for $250. Inch (and yes we do have some inch receivers, although we no longer make them) receivers and will make EXCELLENT FAL rifles.