Hey all, I have a dumb question. This is my first build and it has been going great till now. I am stuck with a low profile gas block with a non-free floated barrel. I attached the barrel and torqued as stated, but the gas tube does not coincide with the holes in the low profile gas block. Not only that, but I don't have a roll pin to even pin it in place. All I got was the gas block, tube and round washer-like thing that I'm not 100% sure on. Please don't laugh. =( Anyway, here's the pics: As you can see, the hole that looks to be for a pin doesn't like up with the tube... Anyway, I'm not 100% what to do, so I thought I'd ask here. I've searched all over trying to figure it out and I just can't. Thanks for any help!