Table:
text: M16 rifle
Summary
Summary
Colt_model_no_ Military_designation Barrel_Length Barrel Handguard_type Buttstock_type Pistol_grip_type Lower_receiver_type Upper_receiver_type Rear_sight_type Front_sight_type Muzzle_device Forward_assist Case_deflector Bayonet_lug Trigger_pack
603 M16A1 20 in (508mm) A1 profile (1:12 twist) Full-length triangular Fixed A1 A1 A1 A1 A1 A1 Three-prong or birdcage flash suppressor Yes No Yes Safe-Semi-Auto
645 M16A1E1/PIP 20 in (508mm) A2 profile (1:7 twist) Full-length ribbed Fixed A2 A1 A1 or A2 A1 or A2 A1 or A2 A2 M16A1 or M16A2-style birdcage flash suppressor Yes Yes or No Yes Safe-Semi-Auto or Safe-Semi-Burst
645 M16A2 20 in (508mm) A2 profile (1:7 twist) Full-length ribbed Fixed A2 A2 A2 A2 A2 A2 M16A2-style birdcage flash suppressor Yes Yes Yes Safe-Semi-Burst
645E M16A2E1 20 in (508mm) A2 profile (1:7 twist) Full-length ribbed Fixed A2 A2 A2 Flattop with Colt Rail Flip-up Folding M16A2-style birdcage flash suppressor Yes Yes Yes Safe-Semi-Burst

text: M16 rifle
Summary
Summary
Colt_model_no_ Military_designation Barrel_Length Barrel Handguard_type Buttstock_type Pistol_grip_type Lower_receiver_type Upper_receiver_type Rear_sight_type Front_sight_type Muzzle_device Forward_assist Case_deflector Bayonet_lug Trigger_pack
601 AR-15 20 in (508mm) A1 profile (1:14 twist) Green or brown full-length triangular Green or brown fixed A1 A1 A1 A1 A1 A1 Duckbill flash suppressor No No Yes Safe-Semi-Auto
602 AR-15 or XM16 20 in (508mm) A1 profile (1:12 twist) Full-length triangular Fixed A1 A1 A1 A1 A1 A1 Duckbill or three-prong flash suppressor No No Yes Safe-Semi-Auto
603 XM16E1 20 in (508mm) A1 profile (1:12 twist) Full-length triangular Fixed A1 A1 A1 A1 A1 A1 Three-prong or M16A1 birdcage flash suppressor Yes No Yes Safe-Semi-Auto

Question: What muzzle devices are on the Colt 603 under the M16 rifles?