Thanks, guys. To be honest, I owned the bottom SPR years ago and can't remember if I ever played with it in that configuration. When it was in its Mk.18 configuration, it was my favorite gun I have ever owned. I was a complete internal noob at the time so it didn't run the best but I loved it just the same. Its also the gun that got my Youtube channel started. The 45 second video running over the gun currently has over 86,000 views and is my highest viewed video by far. I debate rebuilding it every time I start a new build. What holds me back most of the time is my stubbornness in using a gun with "outdated" accessories compared to the gear I normally use. I suppose one day I'll get over my Milsim l33t operator ego and build it anyways.