Does a barrel mounted rail system hold zero better than gas tube cover rail such as the NEA? Just from placing a red dot scope against my CZ858 it looks like it would co-witness very well with a barrel mount but I was not sure about two things. Would bolting on a barrel mount affect the expansion of the barrel when it gets warm during firing? Will the weight from the mount and a red dot scope effect the accuracy? (I would not think it would affect the accuracy but some of you may have tried this)
I guess in general is their a disadvantage to a barrel mount rail?
I guess in general is their a disadvantage to a barrel mount rail?


















































