I am doing a build and have replaced my barrel and gas block with a DD 16" barrel and a low profile gas block. When I was putting it all together I found that when I put the handguard cap on the gas block no longer lined up. I spent the day looking for a railed block that would fit as I am not married to the DD block, to no avail.
My question is what is the downside to sanding that .5mm off the handguard cap so it allows the block to get in alignment?
I would appreciate any help.
Thanks