[2.6 oz / 73 g] You get RRS because everything in the RRS line is beautifully manufactured and of the highest quality. Itâ€s a solid piece and the engravings are etched legibly and very importantly the location of the bubble-level is smartly placed where it can be seen with a camera attached. (Not the case for many other alternative rails out there.)
This piece works perfectly for me being both an adapter for using a new gimbal head with my RRS L-bracket as well as for quickly identifying the so-called “nodal point� setup for shooting panoramic stitched photos.
The RRS website has the best information about finding the “nodal point� for any camera and lens — as well as sharing the actual nodal point measurement for several dozen camera and lens combinations using this rail! They make it so easy.

[2.6 oz / 73 g] You get RRS because everything in the RRS line is beautifully manufactured and of the highest quality. Itâ€s a solid piece and the engravings are etched legibly and very importantly the location of the bubble-level is smartly placed where it can be seen with a camera attached. (Not the case for many other alternative rails out there.)
This piece works perfectly for me being both an adapter for using a new gimbal head with my RRS L-bracket as well as for quickly identifying the so-called “nodal point� setup for shooting panoramic stitched photos.
The RRS website has the best information about finding the “nodal point� for any camera and lens — as well as sharing the actual nodal point measurement for several dozen camera and lens combinations using this rail! They make it so easy.

[0.175 lb] I use the MPR-CL Rail when my lens don't have a mounting foot with my Wimberley Full Gimbal. I attach the rail to the bottom of my camera's L-plate when I use my 14-24mm and my 24-70mm lens especially when I need my Lee Filters Systems. I can rotate the filters without any interference with the shorter MPR-CL Rail. It was a must have for me.

[0.175 lb] Simple and perfect!

[0.175 lb] This rail is perfect with my 10.5 mm fish eye for doing spherical Panos. The longer rail, MPR-CL Rail II at 7.4, might be visible in frame if you use a short lens like I do. For Telephoto lenses you'll definitely want the MPR-CL Rail II.

[2.6 oz / 73 g] I am using this to hold a Canon G7X Mark III and I have added to it the RRS QR Mount and RRS Cold Shoe this allows me to add an off camera microphone. Then this bundle is held on a tripod with a arca-swiss ball head. Rock solid at all points of contact. Fully trustable and overkill for this setup but you get what you pay for and then some.

[0.175 lb] The markings are easy to read, also easy to setup and use in conjunction with a panoramic gimbal head.

[2.6 oz / 73 g] It works just as expected

[2.6 oz / 73 g] It works just as expected

[0.175 lb] Build quality is perfect but the larger 7.4” rail is likely a better option for 99% of dslr users (I returned this and ordered the 7.4”). I bought this 5.7” because I wanted to use it for panoramas with my Sigma 14mm 1.8 art lens and the rrs online video recommended the shorter plate for ultra wide angle lenses but given that the nodal point of those lenses are right near the front optic, I ran out of plate for the clamp to hold before I could get the nodal point. The 7.4” clamp will not get in the way of the wide image unless you have a very short ultrawide angle like the Old Nikon 14mm 2.8 prime. Most ultrawide zooms are long enough that the longer one will not interfere.