I recently just played my first game of 40k against tyranids and won. I had one 10 man army armed with bolters , a missile launcher and a plasma gun. With them staying high and above cover I destroyed 2 troops. I also had one other squad armed with bolters and chainswords and with these I destroyed a Carnifex in close combat but, the carnifex's rolls were very unlucky and only killed 2 men during assault. Once the game finished I realised I could replace the men with chainswords for a obliberator with no extra points added. I would like a Obliberator in my army because It has many powerful guns and from what happened in the game I can say guns are good against tyranids. Is this the right move to nerf the chainswords?