Table:
text: AR-15 variants
MT and CR series models
MT and CR series models
Colt_model_no_ Name_ Stock Fire_control Rear_sight Forward_assist Case_deflector Barrel_length Barrel_profile Barrel_twist Hand_guards Bayonet_Lug Muzzle_device
MT6601 Match Target HBAR A2 S-1 A2 Yes Yes 20 in. HBAR 1:7 Ribbed No None
MT6601C Match Target HBAR A2 S-1 A2 Yes Yes 20 in. HBAR 1:7 Ribbed No Factory compensator
MT6700 Match Target Competition HBAR A2 S-1 Flattop Yes Yes 20 in. HBAR 1:9 Ribbed No None
MT6700C Match Target Competition HBAR A2 S-1 Flattop Yes No 20 in. HBAR 1:9 Ribbed No Factory compensator
MT6731 Match Target Competition HBAR II A2 S-1 Flattop Yes Yes 16 in. HBAR 1:9 Short Ribbed No None

Question: Name the Colt model mt6601 of the AR-15 variants from the MT series and the CR series?