With little effort and basic mechanical skill, the detachable carry handle/rear sight assembly can quickly be turned into a robust fixed rear sight assembly similar in design to the LMT Rear Sight.






Prep the carry handle for work as follows:


  • Remove thumb nuts. Some carry handles come with swaged cross-bars to prevent the thumb nuts from being completely backed off and lost. If enough force is used to turn the nut, the swage can be overcome and the nuts completely removed.


  • Remove locking bar. Set aside. The locking bar will later be trimmed to fit and reinstalled.


  • Use a hammer to tap out the cross-bars. Removing the cross-bars is not a necessary step, but I feel their removal helps in securing the carry handle while it is in work.


  • Using a hacksaw, bandsaw or Dremel Tool with cut-off wheel to cut the carry handle, carefully draw out the cut lines as illustrated below. Leave enough extra material to allow for shaping and contouring. The CCH BUS you see in these photos, was secured in a bench vice and cut with a hacksaw.










For shaping and contouring, a sanding disc in an electric drill was used to form the rounded ears of the BUS, giving it a similar profile to that of the LMT Rear Sight. A combination of jewelers files and fine sandpaper was then used to finish up the final shaping, smoothing and contouring of the cut edges.

The locking bar was then placed temporarily on the BUS, and a position was determined for the necessary cut-line. The locking bar was then secured in a bench vice and cut with a hacksaw. Final shaping and contouring was accomplished with jewelers files. The cut exposed steel edge was then degreased with non-chlorinated brake cleaner and touched up with G96 Liquid Cold Blue applied with a q-tip.

Link: http://http://www.g96.com/Gun_Blue.html

The exposed bare aluminum of the CCH BUS was then degreased with non-chlorinated brake cleaner and touched up with Birchwood Casey Aluminum Black. This process of degreasing and applying Aluminum Black was repeated until a uniform finish was achieved, almost matching perfectly with the remainder of the CCH BUS’s black anodized finish.

Link: http://http://sport.birchwoodcasey.com/Finishing/FinishingDetails.aspx?ProductID=0790cc91-b2e8-488d-a6fa-8820790beefb

One of the many spray-on gun finishes available may be substituted in lieu of the Birchwood Casey Aluminum Black.

Reassemble the CCH BUS by tapping in the cross-bar, seating it fully into the serrations cut from the initial factory assembly. Reinstall the cut and refinished section of locking bar and spin-on the thumb nut.


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Thumb-Nut Mod:

To eliminate the bulkiness and trim some weight from the CCH BUS, I cut down the cross-bar and installed an AN960 aircraft washer with an MS21042 self-locking nut. If this modification is desired, AN/MS Spec aircraft hardware might be available online through an aircraft parts vendor, or similar hardware can be purchased at the local hardware store.