First hi I am new here, but not new to firearms and the shooting sports....

So I have been shooting and building AR-15s for around 6yrs now my first AR was a M&P15T love them, but I always wanted a 308 AR-10 platform rifle and now I have a M&P10. I feel like S&W hit a home run with this rifle especially in the lower receiver, but not so much in the upper. I am in the process of installing a free float hand guard and I had a hell of a time trying to drive out the gas tube roll pin. I broke three roll pin punches used heat and couldn't get the roll pin to move an inch. So I ended up taking a angle grinder with a cutting wheel and cut the gas block off the tube I did grind into the gas tube just a little I thought I ruined it so I ordered another one from S&W, but after looking at it closer I just barely nicked it. Anyway finally getting to my question has anyone else had trouble driving out the gas tube roll pin?