Manufacturers usually have an agreement with their distributors to not compete directly and as a result, will be more expensive. Unfortunately, some early adopters had no idea he would be building and selling through distribution.
[Also, there are cash back referral websites that will get you a few more percent cash back]
I had a couple of questions about the T36C, mainly around suppressor use...
1) .223 use sounds questionable? I mostly have 62gr .223 since I have a bolt action .223 rifle, and it didn't run too well on a F/A G36K last time I tried.
2) The barrel sounds like it's threaded M15? Wasn't sure if the Brownells flavor has a different thread because it has a different flash hider.
3) Sounds like suppressor usage can be tricky since the FH is so close to the handguard. Will a thread adapter (say M15 to 5/8) give enough offset to allow a normal suppressor mount to work? I'd be a bit worried about concentricity, but if it works... Don't have a rifle suppressor right now, but I've been thinking about an OSS of some sort.
Powder puff 223 runs fine in my K, threads are 1/2x28, and if you do happen to have a suppressor that is absolutely flush with the mount you could just install a handguard that doesn’t curve in, which is about every option except the stock one.