URG-I
URG-I Caliber: 5.56 × 45mm M855A1 The full name of URG-I is "Upper Receiver Group, Improved". This project is a project initiated by the U.S. Marine Special Operations Command (USASOC) in 2017 to upgrade the existing SOPMOD II . Tender plan. The emergence of this project is partly because the handguard design with four-sided rails has become no longer popular in recent years (see my article "Picatinny Rails and Two Later Competitors" published on other platforms for details ). Some soldiers or units I will purchase other handguards to replace the handguards from Daniel Defense (DD), such as TORY 's ALPHA, or Geissele's SMR MK4 , etc. Therefore, USASOC simply designated M-LOK as one of the requirements for upgrading. On the other hand, the M8...