Have your friends family contact their lawyer and explain the situation to him. The lawyer can contact ATF and give them the serial number and find out the status of said MG. If contraband,could possibly be cut up for a parts kit or donated to a museum.
If you ever shoot at Dons indoor range,watch picking up your brass. They intend to keep your brass which they claim gets donated to a local hospital-sounds like BS to me.
I have the original design aluminum Sparrow and the only limitation is that it's not rated for 5.7x28. The later stainless steel design will handle the 5.7x28. Both designs will handle full auto fire. Best thing about the Sparrow,it comes apart very easy when dirty. With the SS model you can use...
For the amount of money raked in over the 3 days,someone could afford to hire several off duty officers to patrol the lots. It sucks the fairgrounds is in such a low life area.
I use a 60 gallon compressor at around 100-120psi. I made the blaster out of spare junk. Yes,Arm&Hammer will work fine,I have been buying small boxes of Bakers Corner @ $.50 per box at Aldi.I found out yesterday the soda blaster works well on stainless revolvers.I had 2 .357's that were crudded...
I am assuming you are using the Aguila SSS. Several manufactures recommend against it's use citing it does not stabilize in most barrels and may the baffles.
The joke all stems from the many belt fed rifles that mysteriously had MAC serial numbers several years ago. I believe these were confiscated by ATF and possibly destroyed. Not sure if anyone got prison time for that or not.