HK417 PTW Project/Magazine modification

In this page, instructions of a magazine modification for the PTW HK417 are explained.

■OVERVIEW■
 After transplanting the PTW system into the VFC HK417, you can not use VFC GBB magazines.  In this page, diversion of the magazines of the Tokyo Marui HK417 AEG is instructed.

■STEP1: VERIFYING MAGAZINE PROBLEM OF THE PTW HK417■
 SYSTEMA PTW is AEG system so if you transplant the PTW system into GBB rifles, you can not use anymore magazines of these GBBs.  Therefore, you have to find out a substitution.  In this project, I used magazines of  the Tokyo marui HK417 AEG as the substitution.

 Some readers may say "VFC makes the AEG version HK 417. Why do not you use that magazine?"
  The good reason is an empty detection system of the PTW AEG system.  SYSTEMA PTWs and Tokyo Marui next gen AEGs detect empty of magazines.  However,  the VFC AEG version HK417 dose not have that feature. That means it is easy for you to use magazines of Tokyo Marui HK417 as substitution for the PTW HK417 magazines.

Fig.1 the VFC HK417 GBB magazine and the Tokyo Marui HK417 AEG magazine

■STEP2: VERIFYING DIFFERENCES BETWEEN VFC & TOKYO MARUI MAGAZINES■

  In this project, I divert AEG HK417 magazines made by  Tokyo Marui for PTW HK417.  Fortunately,  I could convert Tokyo Marui magazines for the PTW HK417 easily.  There is 1[mm]  difference of longitudinal length between VFC magazines and Tokyo Marui one as shown Fig.2.  The difference produces very tight and difficult insertion of magazines for operators.  

Fig. 2 Dimension difference between the VFC and Tokyo marui magazine

■STEP3: ADDITIONAL PROCESSING OF TOKYO MARUI MAGAZINES■
  For converting the magazines made by Tokyo Marui for the PTW HK417, you have to shave fore and back end side 0.5[mm] each.  Shaving area is shown as Fig.3.  That figure means you do not have to shave an rib surface of the  back side of magazines because, VFC and Tokyo Marui magazines have same maximum longitudinal length.
 After shaving, the magazines must be as shown Fig.4.  I had used an ultra-micro milling machine for shaving front side, and a micro grinder for shaving back side. However, you can shave that with files.

Fig.3 Shaving area of the Tokyo Marui magazine

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HK417 PTW Project/Motor modification

In this page, instructions of the PTW motor modification to fit to PTW HK417 is explained.

■OVERVIEW■
 Lower receivers of the PTW M4s have mechanical structure for fixing a PTW motor. However, of course, the VFC HK417 GBB dose not have one.  Therefore, you have to design and make a motor mounter for the PTW motor fixing into the VFC HK417 GBB lower receiver.

■STEP1: VERIFYING PROBLEMS TO FITTING THE PTW MOTOR INTO THE VFC HK417 GBB■
 Lower receivers of the PTW M4s have mechanical structure for fixing a PTW motor like as Fig.1. However, the lower receiver of the VFC HK417 GBB dose not have one.  Real AR rifles and M4 GBB rifles have a grip mounter in this spot, so you think like that "Is solution additional machining of holes and a slot?". Unfortunately, it is not (; 'A`)

 

Fig.1 Mechanical structure of  the PTW M4 for fixing the PTW motor

  A critical problem is that the lower receiver of the VFC HK417 GBB has an detachable grip mounter as shown  Fig. 2.  This grip mounter has three screw holes. One hole is used for fixing a grip. Other two screw holes are used for fixing itself into the lower receiver of the VFC HK417 GBB. Latter two screw holes interfere in spring pin holes fixing the PTW motor.  That means it is inappropriate for the lower receiver of the VFC HK417 GBB to additional machining.
  A solution of this project is modifying the PTW motor base. That means developing a new motor base integrates the PTW motor base and the grip mounter of the VFC HK417 GBB.

Fig.2 The Grip mounter of the VFC HK417 GBB

■STEP2: DESIGNING THE MOTOR BASE■
 As the solution of the problem, I had designed a new motor base as shown Fig.3

Fig.3 The new motor base for HK417 PTW

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