with reference now to the drawings , the preferred embodiment of the fixed stock with integral storage is herein described . it should be noted that the articles “ a ”, “ an ”, and “ the ”, as used in this specification , include plural referents unless the content clearly dictates otherwise . with reference to fig1 and 2 , the fixed stock with integral storage 10 is mounted upon the receiver extension tube of a firearm 1 . the depicted firearm is a standard m16 / ar15 firearm with lower receiver component 4 and an upper receiver component 6 which are united to form an entire receiver structure from which barrel 2 extends . the receiver contains the internal workings of the firearm 1 and also features a receiver extension tube 8 ( fig3 ), projecting in a direction opposite the barrel 2 and upon which the stock 10 resides . the invention will be described in this application in relation to this type of firearm and known variants of this system ; however , it is to be understood that the fixed stock may be adapted to other types of firearms with similar structures for use in mounting a stock . this would include airsoft rifles . the term “ receiver extension tube ” is defined to include equivalent structures in other firearm types and similar structures upon which stocks are mounted . in reference to fig3 , the stock 10 is a relatively simple construction . a stock body 12 is provided . the stock body 12 may be of any shape or design with the following requirements : first it must fit over the receiver extension tube or otherwise interface with mounting structure in the firearm &# 39 ; s stock mounting paradigm ; second , the hind end terminates in a circumferential flange which at least partially defines a hollowed chamber and terminates with a rear edge 14 . a cam plug 16 is also provided . the “ cam plug ” is superior to simpler bolt constructions . where the shoulder of a bolt head may serve to secure pieces together by preventing one piece from sliding off of a bolt , a cam plug , as used in this application , is a structure that not only holds two pieces together , but significantly interfaces with the surfaces and / or edges of at least one of the pieces joined . cam plug 16 is designed to interface with the rear edge 14 and the chamber while also attaching to the mounting structure , in this case a receiver extension tube 8 , by use of bolt 18 . by interfacing with the rear edge 14 of the stock body 12 , the cam plug 16 securely anchors and not only joins , but actually cams the stock body 12 between itself and the lower receiver 4 into a more secure mounted relationship than is seen in the prior art . this cam relationship , anchoring the edges 14 of the stock body 12 and filling a portion of the chamber , reduces rotational moments and wobble of the stock body 12 in relation to the lower receiver 4 . it is important to note that the preferred interface of the cam plug 16 with the rear edge 14 of the stock 10 is best shown in fig4 and 5 where a triangular portion of cam plug 16 is visible on both sides of the stock 10 . positioning an interface in this area , behind the receiver extension tube and as broad as possible across the stock body , adds stability and strength to the stock and its connection to the firearm . it is entirely conceivable to not have the cam plug 16 interface with the rear edge 14 , and instead be contained within the chamber of the body 12 of the stock , but this is not preferred . generally , the greater the external interface , the more stable the interface . this must , however , be balanced with the cost to manufacture the components . to this end , a simple interface , as illustrated in the figures , generally a wedge shape on either side of and behind the receiver extension tube and across the stock body 12 will suffice for securement purposes . having the cam plug 16 interface with the edge 14 also allows the cam plug 16 to be easily used in assembling the door 20 to the stock body 12 , as described below . finally , a door 20 is attached to one side of the rear edge 14 and the cam plug 16 . door 20 is connected to the stock 10 by a hinge assembly and selectively held in place by latch 26 . while any construction for the door may suffice , it is preferred the door 20 be a two part construction comprising a door chassis 22 and a rear butt pad 24 , as shown in fig4 - 11 . a set of screws 29 then secures the butt pad 24 to the door chassis 22 ( fig6 ). this allows customization of the butt pad 24 . internal construction of the door 20 is shown in fig1 - 15 . as can be seen , the latch 26 is biased in a closed position by two springs 28 and resides in a latch cage 25 on the door chassis 22 . it is positioned to project from one side of the door chassis 22 and engage a portion of the rear edge 14 of the stock 10 to selectively secure the door 20 . a hinge structure 23 is provided to the other side of the door chassis 22 and houses a hinge rod 27 . hinge rod 27 is slightly larger than hinge structure 23 and nests its ends in the rear edge 14 of the stock 10 and in the cam plug 16 ( fig1 ). to assemble the stock , the cam plug 16 is mostly inserted into the stock body 12 and the hinge rod 27 into the hinge structure . ends of hinge rod 27 are inserted into provided holes in the stock body 12 and the cam plug 16 . the cam plug 16 is then fully inserted into the stock body 12 and secured by bolt 18 to the receiver tube 8 or other stock mounting body , thus securing the door in place 20 . in use then , the latch 26 is disengaged and the door opened to access the internal compartment of the stock 10 , which includes not only general storage , but also the cam plug 16 for installation and removal of the stock 10 . the internal structure of the stock may also include specialized areas for storage of common elements , like batteries , or modules which may be constructed to fit within the compartment . although the present invention has been described with reference to preferred embodiments , numerous modifications and variations can be made and still the result will come within the scope of the invention . no limitation with respect to the specific embodiments disclosed herein is intended or should be inferred .