Another, in-stock, option is the Black River Tactical Covert Comp. It doesn’t have any top-compensating ports and is just a linear comp. It is also not long enough to make a 14.5” into a pinned 16”. You’d need a shim.
Shop BRT Black River Tactical Store Covert Comp OPTIMUM EZTUNE Gas Tube MicroTUNE Gas Block CustomTUNE Gas Port MicroPin Gas Block Mk12 Gas Tube BRT EXT BRT EXC BRT PDW Pistol Carbine Mid Midlength Rifle Upper Receiver Group Bolt Carrier Group Barrels Muzzle Devices Adjustable Gas Drive AR15 LMT
blackrivertactical.com
But, it is much nicer looking and smaller than most linear comps (aside from the Griffin M4SD). It also has decent flash suppression properties. Personally I’m confident in it just being a comp, but some may be scared about AWB violation status because of its advertising claims and it’s “covert” name. Just a heads up.