Slater
06-29-19, 14:05
Normally these types of articles aren't the most accurate (evidenced by the title), but I didn't realize that the M400 had been around that long. Seems to be a reasonably popular weapon, though:
"Sig Sauer revamped the M400 around 2017 with a free float rail and low-profile gas block to win a new batch of contracts. This time, the contracts appear to be domestic, with Detroit and Philadelphia departments adopting the rifle. Oddly, despite the full-length free float rail, this new M400 retains a carbine-length gas system. In 2017, the U.S. military (specifically USASOC) was already looking into mid-length gas systems in the Upper Receiver Group – Improved (URG-I) program to reduce recoil and lessen wear on parts."
https://nationalinterest.org/blog/buzz/did-sig-sauer-just-make-ultimate-ar-15-rifle-64686
"Sig Sauer revamped the M400 around 2017 with a free float rail and low-profile gas block to win a new batch of contracts. This time, the contracts appear to be domestic, with Detroit and Philadelphia departments adopting the rifle. Oddly, despite the full-length free float rail, this new M400 retains a carbine-length gas system. In 2017, the U.S. military (specifically USASOC) was already looking into mid-length gas systems in the Upper Receiver Group – Improved (URG-I) program to reduce recoil and lessen wear on parts."
https://nationalinterest.org/blog/buzz/did-sig-sauer-just-make-ultimate-ar-15-rifle-64686