M40A1s to M40A3s, so DET-1 began the search for COTS (commercial off-the-shelf) surrogates to use. ICQB Pistol Discovering that the Los Angeles Police Department was pleased with their special Kimber-made M1911 pistols, a single source request was issued to Kimber Manufacturing for a similarly built pistol, despite the imminent release of their TLE/RLII models. Kimber shortly began producing a limited number of what would be later termed the Interim Close Quarters Battle pistol (ICQB). Maintaining the simple recoil assembly, 5-inch barrel (though using a stainless steel match grade barrel), and internal extractor, the ICQB is not much different from Browning's original design. The final units as issued to MCSOCOM Det-1 are the Kimber ICQBs with SureFire Integrated Military Pistol Light (IMPL), Dawson Precision rail, Gemtech TRL Tactical Retention Lanyards based upon the jury-rigged telephone cord versions, modified Safariland 6004 holsters, Simonich G-10 Gunner Grips manufactured by Simonich Knives and Strider Knives replaced the original Pachmayr rubber grips, and Wilson Combat's '47D' 8-round magazines. Tritium Novak LoMount sights replaced the originals which were made in-house by the Marines. Replacement A source request was sent out to Springfield Armory and the Springfield Operator, based on the FBI's TRP pistol was built. Due to wear and tear of the MEU(SOC) pistols and increasing numbers of Marine personnel in Force Recon and MARSOC, the U.S. Marines are looking commercially for replacements. Marine Corps Systems Command announced February 17, 2005, that it was going to purchase 150 Springfield Armory Professional Model pistols for use as MEU(SOC) pistols. This is the same pistol used by the Federal Bureau of Investigation SWAT and Hostage Rescue Teams; however, it had previously been rejected for adoption as the ICQB. Despite the planned purchase of the commercial pistols, Marine Corps Systems Command has continued to solicit parts to build additional MEU(SOC) pistols. In 2010, requirements were once more issued for an off-the-shelf system to replace the custom-built pistols. Three pistols were offered to the USMC as a replacement for current M45 Pistols. Colt offered a modified version of their O1980RG (Rail Gun) pistol, which is derived from their existing XSE line of 1911-style pistols with a desert sand-colored surface treatment and Novak night sights. Springfield Armory entered a variant of the full-sized Loaded MC Operator M1911A1 pistol with a military-standard 1913 rail, tritium night sights and finished with a two-tone black slide with an olive-drab green frame. The third entry