Portable firearm receiver having front and rear locking assemblies for removable receiver cover

A firearm receiver includes a receiver housing defining an annular region to receive a bolt of the firearm, and a receiver cover removeably connected to the receiver housing. A guide assembly facilitates movement of the receiver cover relative to the receiver housing between an operating position to cover the annular region, and a non-operating position to expose the annular region and thereby facilitate access to the annular region. Locking assemblies are to facilitate a secure connection between the receiver housing and the receiver cover at the front and the rear of the receiver. The locking assemblies ensure that the receiver cover is securely maintained on the receiver housing during the firing of the firearm, and also enhances the overall structural integrity of the receiver during the firing of the firearm due to the fact the force of the bolt during firing of the firearm is distributed between the receiver housing and the receiver cover.