CMMG Banshee 5.7×28 AR – Conversion Set, SBR, or Pistols

By Jens “Rex Nanorum” Hammer

U.S.A. –-(Ammoland.com)- Recently the PR group that handles CMMG products, Chevalier Advertising, invited a small group of PNW-based reviewers out to a remote rock pit in Oregon for a lengthy range day. Among the highlights of the day was the new 5.7x28mm AR, found in CMMG’s Banshee line-up. This is something I noted during in my SHOT Show notes, though I wasn’t expecting to be shooting one so soon!

Made famous in FN’s P90, the 5.7 round can be found in factory pistol or SBR offerings from CMMG. Additionally, I think the most tempting offer to many buyers, will be the 5.7 conversion package bundles. The MK57 upper arrives in three different barrel lengths, 5″, 8″ and 16″. Though the 16″ upper falls under the Resolute (rifle) line, we’ll stick with the Banshee name throughout the article.

TECH SPECS: (Options depend on bundle package)

• Caliber: 5.7x28mm
• Barrel: 5”-8″-16″ 1:9 Twist, Medium Taper 416SS
• Muzzle: Threaded 1/2-28, with thread protector, A2 Comp or …Read the Rest

  Source:: AmmoLand