Bolt knob replacement

[FNG1001]

Looking at upgrading the bolt knob on a couple Impact actions. Anyone have good reviews on some, and maybe ones to stay away from?
I saw Area 419 has a couple, as does American Precision Arms.

 

[redneckbmxer24]

I use the A419 Remington version on mine and it works well. I don’t like how long the factory knobs are.

 

[PabloPlutarco]

How about a Catalyst Arms Hammerhead bolt knob?

 

[1911Shootist]

I run the Area 419 Impact knob on my 737R. I cut it down about 8mm in length and had to tap it deeper, but after that, I like it. Those actions are so smooth they don’t need a lot of length. I’ve switched all of my actions over to A419 knobs except my NBK - I don’t hate the round knob, and not sure I’m liking that action.