The best brace option, period. - Dead Foot Arms G-Rex Telescoping Tailhook Brace, Complete

Built a BRN-180S pistol that needed a brace. Tried an SB one, but the plastic and rubber was way too wobbly for my liking. This one one the other hand, while more expensive, is all alloy, making it it very rigid and stable. LOP is easily adjustable and the brace folds out to the side very easily and is actually usable (works like the SPAS-12 hook but easier). QD mount is very useful too since the folding 1913 mount I used left very few options for other rear sling mounts.