I have a chance to take a quick look at the only existing LWRCI SMG-45 prototype. First of all, this is a prototype, so production may or may not happen, and it will be some years down the road.
The LWRCI SMG-45 works on what they called an “inertia system”. It is not exactly a straight blowback that relies on the bolt mass to close on the chamber. Rather, it is described as a system where the bolt and barrel work together to create the mass, which are guided by 2 rods inside the receiver. Looking through the ventilation hole in the handguard, the barrel appears to be under spring compression. So it appears that the spring may provide part of the force that is needed to keep the bolt close during firing.
The lower receiver uses AR15 fire control part, and the current intention is to use HK UMP 45 magazines. So this could be targeted to agencies that are currently using the UMP.
The LWRCI SMG-45 works on what they called an “inertia system”. It is not exactly a straight blowback that relies on the bolt mass to close on the chamber. Rather, it is described as a system where the bolt and barrel work together to create the mass, which are guided by 2 rods inside the receiver. Looking through the ventilation hole in the handguard, the barrel appears to be under spring compression. So it appears that the spring may provide part of the force that is needed to keep the bolt close during firing.
The lower receiver uses AR15 fire control part, and the current intention is to use HK UMP 45 magazines. So this could be targeted to agencies that are currently using the UMP.
