Every gun nerd knows about SOPMOD. SOPMOD refers to Special Operations Peculiar MODification kit.
This stuff:
The purpose behind SOPMOD is to provide rifles with the flexibility and versatility to adapt basic issue weapons to meet mission-specific requirements.
It started off a lot less high-speed.
Retired Navy SEAL Mark “Coch” Cochiolo talks about his career in SOPMOD, with a great 11-minute show and tell below going from the old days of pipe-clamping Maglights on MP5s, and drilling eye-bolts through handguards to where we are at today.