Mid lock-up receiver

Abstract

Mid lock-up receivers have an elongated body, the body defining a passage, the body having a first rear portion and a second forward portion adjacent to and forward of the rear portion, the first rear portion defining a first passage segment having a first diameter and the second forward portion defining a second passage segment having a second diameter greater than the first diameter, a stop surface defined at a forward end of the first rear portion, an elongated sleeve defining a sleeve passage and received in the second passage segment, the sleeve having a rear-facing limit surface spaced apart from the stop surface, and the sleeve being compressively received in the body wherein the body is in tension about the sleeve, and the sleeve is compressed by the body. The sleeve may be thermally bonded to the body.

I claim: 
     
         1 . A firearm bolt action receiver comprising:
 an elongated body;   the body defining a passage;   the body having a first rear portion and a second forward portion adjacent to and forward of the rear portion;   the first rear portion defining a first passage segment having a first diameter and the second forward portion defining a second passage segment having a second diameter greater than the first diameter;   a stop surface defined at a forward end of the first rear portion;   a sleeve defining a sleeve passage and received in the second passage segment;   the sleeve having a rear-facing limit surface spaced apart from the stop surface; and   wherein the rear-facing limit surface of the sleeve and a forward-facing limit surface of the sleeve spaced apart from the rear-facing limit surface define a bolt lug space.