This 5.56X45 NATO ammo can be found on the Lucky Gunner website, but clicking the buy button.
These 62 grain green tips are similar to what the US Military uses in their M16/M4 carbine platforms. The heavier bullet does great stabilizing in the 1:7 through 1:9 twist rate barrels, but likes the 1:7 and 1:8 most.
The green tip on the M855 is a steel tip that is designed for greater penetration into hard surfaces, but is not necessarily an armor piercing round.
This will do well in most AR-15 rifles chambered in 5.56 NATO, but not necessarily those chambered in .223 Remington.