Edit: Finally got some pictures hosted
I have been piecing together a gun from parts I have tried out and have either failed me or just didn't suit me for what ever reason.
This gun was basically being built around a M6A2 upper I have that hasn't served me well, but functions 99% of the time. It was to use lower parts that did not turn out to be quality as I learned more like a RRA nm trigger or a stag ambi selector. Also used is a PWS piston buffer tube to deal with carrier tilt I had.
I have my Aimpoint on it because I found out I have astigmatism and the dot blooms for me. There are fixed DD rear and Troy front irons. I found I preferred folding for use with my ACOG.
Then there are parts like an Armadynamics ambi charging handle, POF roller cam pin and Adams arms bolt spring. These are parts I wanted to try in the past but I don't trust them from a reliability stand point. Since this is a range toy now they have found a good home.
I particularly dis-like the LWRC rail and think its a pos. It is heavy, short and doesn't line up with the receiver. When I sent my upper back to LWRC for issues it was having they installed a new upper receiver, it came back to me with ripped and bent tabs for aligning the rail to the upper receiver.
I saw the Samson for end I put it on a LW upper I have that used a DD 14.5" CHF LW barrel. I like how light it was but was not totally sold on how it attached to the gun. After trying it I decided to suck up the extra weight and spend the money time and to put a DD 12" lite rail on it. It is my go to gun and I wanted it done right.
I had the Samson rail sitting in my tool box at my shop while I have been piecing together this gun with scraps I had. I decided it would only be logical to use it on this project.
I took off the LWRC rail and took some measurements with calipers to figure out how much I would need to grind out of the Samson rail. It seemed fairly minimal and I decided to test fit the Samson rail to see just how bad a fit it was. It slipped right on with no fuss and lined up well. I know the piston parts won't rub because the gas block is taller than it.
To be clear. It goes on with no modifications at all. You remove the four allens for the LWRC rail, snap on the Samson heat sink, slide on the for end and tighten two allens, done. Takes five minutes, if that.
I think the Samson Evolution rail has its flaws, but is much better than the LWRC rail. The Samson Evolution is: Longer, thinner, much lighter, cheaper and attaches better than the LWRC rail.
LWRC is releasing the SPR rail, but it will require a different barrel nut and more smithing. It would especially be prohibitive for guns with a pinned muzzle device. Then there is pricing and availability. The 11” Samson rail I have was 159$ and uses the factory barrel nut.