The C-TAC Proline Series by VFC includes four models: The M4 Carbine, the M4 Tactical, the MK12 SPR, and finally, the SR15. These rifles, while similar in function, each have their own unique roles on the field. No matter the play style, there is a rifle to fit any Shooter’s needs.The M4 Carbine:This is a no-nonsense M4 that will perform no matter the conditions. This rifle is useful in every situation. It may not look fancy, but it is dependable in every situation. You don’t need fancy, but you certainly need dependable. The carry handle is removable, so optics can be added. The stock is retractable as well to help you adapt to whatever situation may arise.The M4 Tactical:Similar to the Carbine, but beefed up with a lot more rail space, folding sights, and a comfortable retractable crane stock. The full rail will allow you to attack grips, lasers, lights, optics, and anything else you could dream of. The ability to customize this rifle is nearly unparalleled in the airsoft world!The MK12 SPR:A “Special Purpose Rifle” indeed. Designed for further engagements, this rifle is truly a marvel. Complete with a fully licensed Knight’s Armament 310mm RIS rail system, the possibilities are endless as to what you can add to this rifle. To the back of the rifle, you will find a fixed stock that will proved the shooter with stability and comfort.The SR15:Finally, the SR15. This rifle is a healthy blend of all of the above, and then some. Featuring a fully licensed Knight’s Armament RIS rail system, a retractable crane stock, and low-profile flip sights, this rifle is also fully ambidextrous and comes with a detachable vert grip. This rifle is a Shooter’s dream.Final Notes:These four rifles look and feel like their real-steel counter-part. Each one of these AEGs will have heat-treated gear-sets, reinforced pistons, and steel selector plates. This trusty line of rifles is not only high quality in externals, but equally high in internals. Being manufactured by VFC, this means the quality is out of this world, and the ability to upgrade is just as high. The truth is, you won’t ever regret buying any one of these rifles. There is a style for everyone, and the quality speaks for itself.