It is difficult to say with the limited photo's, only one of which shows any real detail of the receiver, but I have an awful feeling that this monstrosity may have been perpetrated on a genuine 4T. Look closely at the fit & finish of the front pad. I suspect it may be right, but 'improved' by the addition of the spurious characters, No5 flash eliminator etc. If so, it's tragic, as the muzzle can be sorted, but the stamped markings on the receiver are there for good, save for judicious TIG welding & an extensive refinish job.............
ATB