Around November of 2018 Arms Unlimited was able to receive some production over-run LE6940P Carbine Piston lower receiver assemblies from Colt. These started out on Arms Unlimited’s website around $399. The final cost when the last of their inventory was sold was $300. The following photos shows the LE6940P Carbine Piston lower receiver as sold by Arms Unlimited. AU was the only source for these lower receivers other than someone taking one off of a complete LE6940P rifle.