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Product Review on HK Mark 23 Rail Mount Adapter

Evaluation of Mark 23 Rail Light Adapter and Laser Light Adapter (Evaluated by Big Bore - 07/22/2010)

       When I was asked to do an evaluation of the Rhyno Technologies’ (http://www.rhynotek.com) Mark 23 light adapter (LA) and laser/light adapter (LLA) I was more than happy to do so. The light adapter is open at the front of the rail and weighs 1.7 ounces and is designed for use with any tactical light that will fit a Picatinny type rail. The laser/light adapter is closed at the front for extra rigidity and weighs 1.8 ounces, very slightly heavier than the LA and is intended for laser/light mounting of any unit also fitting the standard Picatinny rail system. The extra rigidity of the LL adapter is to ensure the laser will maintain zero and not shift, even after repeated mounts and dismounts.
       Upon opening the package containing the adapters I was impressed by the quality of the machine work these adapters show.  Both adapters are made from aircraft grade aluminum (I am not sure of the exact composition) CNC machined to exacting tolerances.  The LA’s finish was not perfect with slight anodizing imperfection and had a small nick on the upper edge of the adapter, but I was told this is a blemished unit beforehand so I was expecting a less than perfect finish on this particular unit, but the slight imperfections in the finish and small nick will in no way affect the function of the adapter.  The roughness of the nick could snag the skin so I will remove it with a little 600 grit paper and touch up with Birchwood Casey Aluminum Black or spray it with Brownell’s Aluma-Hyde II matte black.  Also on this unit there is a small milling swirl at the back of the rail.  But I stress, function is not affected and this particular unit is a blemished unit so perfection would be foolish to expect.
       The finish on the LL adapter was near perfect, a matte black anodizing which matches the finish on the Mark 23’s frame very nicely and only very minor machine marks are seen along the side of the Picatinny rail.  If one wants one absolutely free of machine marks one would expect to pay double for what these units are expected to sell.

       Both units attach via a single Allen head screw that turns into the front of the trigger guard on the Mark 23 after sliding over the front rails on the dust cover of the Mark 23, making for a very secure mount. The LA unit slid onto the Mark 23’s rail easily while the LLA slid on the rail with some resistance, but not enough to mark the pistol’s rails. However, there was absolutely no movement between either adapter and the frame of the Mark 23 when mounted.
       I can find only two things to fault. The first is really nit-picky but I was not asked to do a puff review but an honest one including critical comments. The sides of the half-moon shaped mounting block are parallel while the front of the Mark 23’s trigger guard is tapered, wider at the top than at the bottom. The top of the adapter is the same width as the trigger guard but since it is not tapered, at the bottom of the trigger guard it sticks out from it .050 inch, not much but noticeable.

       The second is that a tool is needed to mount the adapter to the Mark 23 so if it were to come loose in the field, or one wished to remove it or install it in the field, you must have an Allen wrench to install, remove, or retighten.  How it would possibly come loose I cannot say, but we all know what can happen when Murphy is around.  An option would be to use a thumb-wheel head on the mounting bolt so that it could be finger tightened if it came loose and no tool would be needed to install or remove the adapter.  However, a thumb-wheel cap would add width and depth to the adapter since it would have to protrude past the sides of the adapter. As the unit is, the light or laser must be removed before removing the adapter whereas if a thumb-wheel were used the light/laser could remain attached to the adapter while the entire adapter/light/laser was removed as a single unit.  However, a thumb-wheel type of mount may be protected by patents since it is the style Wilcox Industries use to mount its LAM units to the Mark 23.

       Installing a Streamlight TLR-1 on the LA was a snap.  When tightened down it was rock solid and there is not the slightest doubt it will offer many years of service at an exceptional price.  The rear panel controls of the TLR-1 were within easy reach of the off hand’s forefinger so no pressure pad is needed.  Operation was flawless and the multi-slotted rail makes for easy positioning on the pistol for those with longer fingers than I.  Even with the light as far back as it would go, the adapter did not interfere with the operation of the light’s controls.   

       Switching over to the LL adapter was equally simple.  First I tried to install the Streamlight M6.  This light would not fit due to height of the sides of the light’s rail.  However, exactly ten strokes of the top of the M6’s rail on some 600 grit paper had the M6 fitting like it was made especially for this rail.  Fit was very snug and I have no doubt that zero will be maintained with the laser.

       Putting on the Streamlight TLR-2 was uneventful.  Everything said about the TLR-2 applies to the TLR-2 also.  Zeroing in the laser was easily done with a .050 Allen wrench.

       Live fire evaluation to follow… Read Live Test Report ... Go Back to Product Page