I don't even use the "bleed off" - Superlative Arms Adjustable Bleed Off Gas Block

I buy these because its still the best deal on adjustable gas blocks even if you have no intention of using the bleed off feature, which in my opinion is a little silly. Bleed off will get you reduced gas but it will also get the front of your rifle and suppressor coated in carbon almost immediately. I just use these in traditional gas restricted mode, no complaints.