I bought a spikes tactical combo with barrel and gas block with the GB already drilled for a pin. For the life of me I can not get the pin to go through the hole. Its like I am trying to tap a square pin into and round hole.

I have checked spikes website and searched google for any information I could find. Every video I watched they just tapped it in.

Is the barrel drilled to match the GB? Did the barrel and GB come with the pin? Is it straight or tapered pin setup?

I assume the GB and barrel were drilled as a hole. I bought it as a package deal from Aim Surplus.

Pin is a tapered. What I have thinking now after looking it doesn't look like a 2/0 reamer was ran down it I drove all over town to find one but no one had it.

I helped a buddy with his.  I was patient, got a bigger hammer, and pounded harder.  It still took many times to pound that thing in.  Freaked me out.  They are super tight!!!!   His barrel shoots lights out!
 

Never "assume" anything. It is true tho, one would think the GB and barrel were drilled together. Is there some sort of mark(s) on the barrel where the pin would go? I have never seen a pin that hard to install if it is drilled and reamed properly, and you should not have to use the procedure Lug1 has described. Contact the seller or manufacturer before beating anything to death, that may void any kind of warranty.

Nothing was beaten to death. No marks were left and barrel and Gb are still installed properly with no marks.  It required more force than usual.  Send it back if you like.  That is always a good option if you don't think it's gonna work.  The one we worked on worked fine.  We had it on in 5 mins after getting out appropriate tools to get the job done.  It was simply tighter than normal.  Had a 2/0 reamer on my work bench if I had been overly concerned.  And the mark on the barrel is the pin hole where the pin goes.  Install from the right side.  Remove from the left.  And I personally remember it being a straight pin on my buddies. But it's been a while.

 

Lug1, nothing negative meant by my reply. It just seemed a bit "heavy handed" with a 24 oz hammer, lol. I admit there are times I want to beat something (or someone) with a big hammer.

is the pin hole where the pin goes.  Install from the right side.  Remove from the left.  And I personally remember it being a straight pin on my buddies. But it's been a while.

Thanks for your guys help in this.

This my be a stupid question but what is determined the right side? Looking down the sights or looking backwards.   I was installing it as right side being down the sights.

this was the email I got from spikes.

It should be a “Straight Pin”. The best way to install it is to align the hole first and lock it in place with the set-screw. One end of the Pin should have a slight bevel. That’s the easiest side to start with. You need to properly support the Barrel and gas-block on a very solid surface. Our Armorers use a small Hammer and many fast taps to install them. A Big Hammer is NOT the answer. Give that a try. Let me know how it goes…