Receiver shim to delete the clearence and play between upper and lower receiver.
For reasons of compatibility and easy assembly, the factory CZ Scorpion EVO 3 has greater tolerance in the area ofthe mounting pin. This causes a certain play between the upper and lower receiver (see video). This receiver shim has no effect on the interchangeability of parts but removes the unpleasant movement between both upper and lower receiver.
It is designed to work with original polymer hanguard on EVO 3 S1 Pistol or Carbine which both have flat bottom of the upper receive/handguard at the contact point. There might be a compatibility issue with some other variants or combinations of aftermerket parts.
Some very early pieces might be missing the rib in the lower receiver which the shim uses as an attachment point. Also the hole where the shim suppose to fit is smaller. In this case the shim won't fit in the receiver as it was desined to do.
