I’d have to agree on that. The KAK brace made my 300BO miserable to shoot. The SBA3 turned it into a viable PDW.
Cool, that is what I have heard. I briefly looked at the SBA4 but it seemed like more bulk than I wanted on this. If it had only added the cross bar support and not bulked up elsewhere I would have went with the 4 (as I found them for the same price of the cheapest SBA3 I found).
Straight blow back design of the 9mm PDW along with the KAK does not make for a good comfortable combination. It's a fun gun, and the SBA should make it have less of a hangover effect after a range trip.
That said, I just didn't want to deal with doing an SBR.