5.7x28 vs 223 Ammo: Rifle Caliber Comparison by Ammo.com
Will Glock ever chamber a product in 5.7 x 28 ? Probably not, but I would like a body armor penetration option for my glock handgun , as bad guys now can
5.7x28mm vs. 9mm — Which is Better? - Firearms News
FNH 5.7x28 in Clear Ballistics Gel - The Firing Line Forums