Does anyone make a 9mm lower reciever block? We need 20 of them.
You could try Specialized Armament to see if you could get Colt blocks:
http://www.specializedarmament.com/
Rock River also makes one. They are pretty much a copy of the Colt block.
http://www.rockriverarms.com/index.cfm?fuseaction=category.display&category_id=244
The VM Hy-Tech block is held in by the normal mag catch, and uses standard Uzi mags with no modifications.
The mag catch for the Uzi mags is below the AR mag well, so it is different.
I’ve never used one, but I’ve read of people dumping the mag and adapter they hit the AR mag release.
http://www.brownells.com/.aspx/pid=19669/Product/AR_15_M16_9mm_MAG_BLOCK_ADAPTER
TOS has an active subforum on rimfire/pistol calibers, if you are willing to wade through the crap and learn who the smart people are that won’t give you stupid advice. GHPorter and kevins_garage are good, among others.
My mistake for not specifying correctly. We are looking for a lower receiver vice block for 9mm carbines.