Gas block - Crosspinning vs dimpling

[JediGuy]

I picked up a barrel and gas block from BA, and they came cross drilled with a pin. Is there any reasonable reason to dimple in addition to this? It would seem that it satisfied the same purpose that dimpling usually serves.

[georgeib]

You're correct in your assessment: there's no point in dimpling if it's pinned.

[JediGuy]

Thanks!

[BufordTJustice]

Agreed with above IF the hole is a taper hole as drilled and the pin is a taper pin.


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[AndyLate]

Deleted due to low knowledge base.

[markm]

I am struggling with the question of pinning a barrel that is dimpled, I probably will, just as insurance.

There's no need. In my opinion, pinning is overkill on a lo pro that's under a rail. A dimple with rockset on the set screw is plenty. I've done a bunch of lo pro blocks, and have yet to see one that moved.

[MegademiC]

I do not understand what difference the type of pin makes. If the gas block is pinned, there is no reason to dimple the barrel to ensure the gas block is in the correct spot and is not rotated. The pin will ensure both are correct.

I am struggling with the question of pinning a barrel that is dimpled, I probably will, just as insurance.

If you put a cylinder in a hollow cone, its only secure on one side... or am i completely missing something?
I would assume the hole is tapered. If not, how is the pin secured?

[hk_shootr]

BA’s low profile gas block uses a single roll pin. The hole is not tapered, the pin is secured by friction and the spring pressure of the roll pin it’s self.

[AndyLate]

Deleted due to low knowledge base.

[hk_shootr]

I don’t like the idea that BA uses a roll pin vs a solid straight to taper pin