Just a quick test with cheap PPU (Prvi Partizan) ammo in 5.56 Nato (.223 Rem) with my AR15.
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Manufacturer: Oberland Arms
Model: OA15 M1 - TRH Tactical Rail Handguard
Barrel lenght: 20-Zoll/508mm
Twist: 1-8" twist (6 grooves/right-handed)
Caliber: .223 Rem
Optics: Vortex Viper PST 6-24x50 SFP
Mount: Burris P.E.P.R.
Ammo: PPU (Prvi Partizan) FMJ BT 55gr - 5.56x45 (M193)
55grn lead core full copper jacketed bullet, brass case, and non-corrosive boxer primer.
Distance: 100m/109yard