SLR Receiver/Handguard stabiliser

By default, the SLR receiver and hand guard interface is only via the barrel nut which can easily unscrew with a good twist. This small piece replaces the spacer that sits under the top rail in the handguard, and slides into a small hex shaped hole in the receiver when assembling them to stop the handguard from rotating, and inadvertantly undoing the barrel nut.

Id recommend printing it as the file is supplied so that the filament grain is down the hex part for strength against the twisting.