One of the best bolt catches - Geissele Maritime Bolt Catch

I put certain Geissele products in practically every ar build:

super 42 spring buffer spring
h2 buffer
buffer tube
ultra duty take down pins
ultra duty mag release
ultra duty bolt catch
super duty/ultra duty trigger guard

basically their ultra duty lpk is the business

looks great, great area coverage and tactile feel

only downsides, make sure it fits with other part anatomy. still uses the roll pin method which is atrocious and archaic as opposed to the allen key aero m4e1 enhanced method.

kns precision trigger pins must be installed before this.