223 Rem 55 Grain FMJ Brass Case Swiss made Geco Ammo for sale at SGAmmo.com, your best online source for 223 Ammo for AR-15 rifles. This high quality ammo is made in Switzerland featuring a 55 grain FMJBT bullet with copper jacket and a lead core non-magnetic projectile that is range safe. The cartridge also features an annealed brass case with crimped in boxer primers that are lacquer sealed. The case mouth is also sealed to help water proof the ammo. The ammo is loaded on plastic stripper clips, but from my testing the clips are not compatible with USGI guide tools so you may have to remove the rounds from the clips manually to load your mags, or find an alternative loading tool or modify a USGI guide tool. This is very very nice 223 Rem ammo for your AR-15 rifle or any 223 caliber firearm. Ballistic data shows 3313 FPS muzzle velocity out of a 23.6 inch barrel.